public/javascripts/prototype.js

   1 /*  Prototype JavaScript framework, version 1.6.0.1
   2  *  (c) 2005-2007 Sam Stephenson
   3  *
   4  *  Prototype is freely distributable under the terms of an MIT-style license.
   5  *  For details, see the Prototype web site: http://www.prototypejs.org/
   6  *
   7  *--------------------------------------------------------------------------*/
   8
   9 var Prototype = {
  10   Version: '1.6.0.1',
  11
  12   Browser: {
  13     IE:     !!(window.attachEvent && !window.opera),
  14     Opera:  !!window.opera,
  15     WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
  16     Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
  17     MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  18   },
  19
  20   BrowserFeatures: {
  21     XPath: !!document.evaluate,
  22     ElementExtensions: !!window.HTMLElement,
  23     SpecificElementExtensions:
  24       document.createElement('div').__proto__ &&
  25       document.createElement('div').__proto__ !==
  26         document.createElement('form').__proto__
  27   },
  28
  29   ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  30   JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
  31
  32   emptyFunction: function() { },
  33   K: function(x) { return x }
  34 };
  35
  36 if (Prototype.Browser.MobileSafari)
  37   Prototype.BrowserFeatures.SpecificElementExtensions = false;
  38
  39
  40 /* Based on Alex Arnell's inheritance implementation. */
  41 var Class = {
  42   create: function() {
  43     var parent = null, properties = $A(arguments);
  44     if (Object.isFunction(properties[0]))
  45       parent = properties.shift();
  46
  47     function klass() {
  48       this.initialize.apply(this, arguments);
  49     }
  50
  51     Object.extend(klass, Class.Methods);
  52     klass.superclass = parent;
  53     klass.subclasses = [];
  54
  55     if (parent) {
  56       var subclass = function() { };
  57       subclass.prototype = parent.prototype;
  58       klass.prototype = new subclass;
  59       parent.subclasses.push(klass);
  60     }
  61
  62     for (var i = 0; i < properties.length; i++)
  63       klass.addMethods(properties[i]);
  64
  65     if (!klass.prototype.initialize)
  66       klass.prototype.initialize = Prototype.emptyFunction;
  67
  68     klass.prototype.constructor = klass;
  69
  70     return klass;
  71   }
  72 };
  73
  74 Class.Methods = {
  75   addMethods: function(source) {
  76     var ancestor   = this.superclass && this.superclass.prototype;
  77     var properties = Object.keys(source);
  78
  79     if (!Object.keys({ toString: true }).length)
  80       properties.push("toString", "valueOf");
  81
  82     for (var i = 0, length = properties.length; i < length; i++) {
  83       var property = properties[i], value = source[property];
  84       if (ancestor && Object.isFunction(value) &&
  85           value.argumentNames().first() == "$super") {
  86         var method = value, value = Object.extend((function(m) {
  87           return function() { return ancestor[m].apply(this, arguments) };
  88         })(property).wrap(method), {
  89           valueOf:  function() { return method },
  90           toString: function() { return method.toString() }
  91         });
  92       }
  93       this.prototype[property] = value;
  94     }
  95
  96     return this;
  97   }
  98 };
  99
 100 var Abstract = { };
 101
 102 Object.extend = function(destination, source) {
 103   for (var property in source)
 104     destination[property] = source[property];
 105   return destination;
 106 };
 107
 108 Object.extend(Object, {
 109   inspect: function(object) {
 110     try {
 111       if (Object.isUndefined(object)) return 'undefined';
 112       if (object === null) return 'null';
 113       return object.inspect ? object.inspect() : object.toString();
 114     } catch (e) {
 115       if (e instanceof RangeError) return '...';
 116       throw e;
 117     }
 118   },
 119
 120   toJSON: function(object) {
 121     var type = typeof object;
 122     switch (type) {
 123       case 'undefined':
 124       case 'function':
 125       case 'unknown': return;
 126       case 'boolean': return object.toString();
 127     }
 128
 129     if (object === null) return 'null';
 130     if (object.toJSON) return object.toJSON();
 131     if (Object.isElement(object)) return;
 132
 133     var results = [];
 134     for (var property in object) {
 135       var value = Object.toJSON(object[property]);
 136       if (!Object.isUndefined(value))
 137         results.push(property.toJSON() + ': ' + value);
 138     }
 139
 140     return '{' + results.join(', ') + '}';
 141   },
 142
 143   toQueryString: function(object) {
 144     return $H(object).toQueryString();
 145   },
 146
 147   toHTML: function(object) {
 148     return object && object.toHTML ? object.toHTML() : String.interpret(object);
 149   },
 150
 151   keys: function(object) {
 152     var keys = [];
 153     for (var property in object)
 154       keys.push(property);
 155     return keys;
 156   },
 157
 158   values: function(object) {
 159     var values = [];
 160     for (var property in object)
 161       values.push(object[property]);
 162     return values;
 163   },
 164
 165   clone: function(object) {
 166     return Object.extend({ }, object);
 167   },
 168
 169   isElement: function(object) {
 170     return object && object.nodeType == 1;
 171   },
 172
 173   isArray: function(object) {
 174     return object && object.constructor === Array;
 175   },
 176
 177   isHash: function(object) {
 178     return object instanceof Hash;
 179   },
 180
 181   isFunction: function(object) {
 182     return typeof object == "function";
 183   },
 184
 185   isString: function(object) {
 186     return typeof object == "string";
 187   },
 188
 189   isNumber: function(object) {
 190     return typeof object == "number";
 191   },
 192
 193   isUndefined: function(object) {
 194     return typeof object == "undefined";
 195   }
 196 });
 197
 198 Object.extend(Function.prototype, {
 199   argumentNames: function() {
 200     var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
 201     return names.length == 1 && !names[0] ? [] : names;
 202   },
 203
 204   bind: function() {
 205     if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
 206     var __method = this, args = $A(arguments), object = args.shift();
 207     return function() {
 208       return __method.apply(object, args.concat($A(arguments)));
 209     }
 210   },
 211
 212   bindAsEventListener: function() {
 213     var __method = this, args = $A(arguments), object = args.shift();
 214     return function(event) {
 215       return __method.apply(object, [event || window.event].concat(args));
 216     }
 217   },
 218
 219   curry: function() {
 220     if (!arguments.length) return this;
 221     var __method = this, args = $A(arguments);
 222     return function() {
 223       return __method.apply(this, args.concat($A(arguments)));
 224     }
 225   },
 226
 227   delay: function() {
 228     var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
 229     return window.setTimeout(function() {
 230       return __method.apply(__method, args);
 231     }, timeout);
 232   },
 233
 234   wrap: function(wrapper) {
 235     var __method = this;
 236     return function() {
 237       return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
 238     }
 239   },
 240
 241   methodize: function() {
 242     if (this._methodized) return this._methodized;
 243     var __method = this;
 244     return this._methodized = function() {
 245       return __method.apply(null, [this].concat($A(arguments)));
 246     };
 247   }
 248 });
 249
 250 Function.prototype.defer = Function.prototype.delay.curry(0.01);
 251
 252 Date.prototype.toJSON = function() {
 253   return '"' + this.getUTCFullYear() + '-' +
 254     (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
 255     this.getUTCDate().toPaddedString(2) + 'T' +
 256     this.getUTCHours().toPaddedString(2) + ':' +
 257     this.getUTCMinutes().toPaddedString(2) + ':' +
 258     this.getUTCSeconds().toPaddedString(2) + 'Z"';
 259 };
 260
 261 var Try = {
 262   these: function() {
 263     var returnValue;
 264
 265     for (var i = 0, length = arguments.length; i < length; i++) {
 266       var lambda = arguments[i];
 267       try {
 268         returnValue = lambda();
 269         break;
 270       } catch (e) { }
 271     }
 272
 273     return returnValue;
 274   }
 275 };
 276
 277 RegExp.prototype.match = RegExp.prototype.test;
 278
 279 RegExp.escape = function(str) {
 280   return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
 281 };
 282
 283 /*--------------------------------------------------------------------------*/
 284
 285 var PeriodicalExecuter = Class.create({
 286   initialize: function(callback, frequency) {
 287     this.callback = callback;
 288     this.frequency = frequency;
 289     this.currentlyExecuting = false;
 290
 291     this.registerCallback();
 292   },
 293
 294   registerCallback: function() {
 295     this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
 296   },
 297
 298   execute: function() {
 299     this.callback(this);
 300   },
 301
 302   stop: function() {
 303     if (!this.timer) return;
 304     clearInterval(this.timer);
 305     this.timer = null;
 306   },
 307
 308   onTimerEvent: function() {
 309     if (!this.currentlyExecuting) {
 310       try {
 311         this.currentlyExecuting = true;
 312         this.execute();
 313       } finally {
 314         this.currentlyExecuting = false;
 315       }
 316     }
 317   }
 318 });
 319 Object.extend(String, {
 320   interpret: function(value) {
 321     return value == null ? '' : String(value);
 322   },
 323   specialChar: {
 324     '\b': '\\b',
 325     '\t': '\\t',
 326     '\n': '\\n',
 327     '\f': '\\f',
 328     '\r': '\\r',
 329     '\\': '\\\\'
 330   }
 331 });
 332
 333 Object.extend(String.prototype, {
 334   gsub: function(pattern, replacement) {
 335     var result = '', source = this, match;
 336     replacement = arguments.callee.prepareReplacement(replacement);
 337
 338     while (source.length > 0) {
 339       if (match = source.match(pattern)) {
 340         result += source.slice(0, match.index);
 341         result += String.interpret(replacement(match));
 342         source  = source.slice(match.index + match[0].length);
 343       } else {
 344         result += source, source = '';
 345       }
 346     }
 347     return result;
 348   },
 349
 350   sub: function(pattern, replacement, count) {
 351     replacement = this.gsub.prepareReplacement(replacement);
 352     count = Object.isUndefined(count) ? 1 : count;
 353
 354     return this.gsub(pattern, function(match) {
 355       if (--count < 0) return match[0];
 356       return replacement(match);
 357     });
 358   },
 359
 360   scan: function(pattern, iterator) {
 361     this.gsub(pattern, iterator);
 362     return String(this);
 363   },
 364
 365   truncate: function(length, truncation) {
 366     length = length || 30;
 367     truncation = Object.isUndefined(truncation) ? '...' : truncation;
 368     return this.length > length ?
 369       this.slice(0, length - truncation.length) + truncation : String(this);
 370   },
 371
 372   strip: function() {
 373     return this.replace(/^\s+/, '').replace(/\s+$/, '');
 374   },
 375
 376   stripTags: function() {
 377     return this.replace(/<\/?[^>]+>/gi, '');
 378   },
 379
 380   stripScripts: function() {
 381     return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
 382   },
 383
 384   extractScripts: function() {
 385     var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
 386     var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
 387     return (this.match(matchAll) || []).map(function(scriptTag) {
 388       return (scriptTag.match(matchOne) || ['', ''])[1];
 389     });
 390   },
 391
 392   evalScripts: function() {
 393     return this.extractScripts().map(function(script) { return eval(script) });
 394   },
 395
 396   escapeHTML: function() {
 397     var self = arguments.callee;
 398     self.text.data = this;
 399     return self.div.innerHTML;
 400   },
 401
 402   unescapeHTML: function() {
 403     var div = new Element('div');
 404     div.innerHTML = this.stripTags();
 405     return div.childNodes[0] ? (div.childNodes.length > 1 ?
 406       $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
 407       div.childNodes[0].nodeValue) : '';
 408   },
 409
 410   toQueryParams: function(separator) {
 411     var match = this.strip().match(/([^?#]*)(#.*)?$/);
 412     if (!match) return { };
 413
 414     return match[1].split(separator || '&').inject({ }, function(hash, pair) {
 415       if ((pair = pair.split('='))[0]) {
 416         var key = decodeURIComponent(pair.shift());
 417         var value = pair.length > 1 ? pair.join('=') : pair[0];
 418         if (value != undefined) value = decodeURIComponent(value);
 419
 420         if (key in hash) {
 421           if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
 422           hash[key].push(value);
 423         }
 424         else hash[key] = value;
 425       }
 426       return hash;
 427     });
 428   },
 429
 430   toArray: function() {
 431     return this.split('');
 432   },
 433
 434   succ: function() {
 435     return this.slice(0, this.length - 1) +
 436       String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
 437   },
 438
 439   times: function(count) {
 440     return count < 1 ? '' : new Array(count + 1).join(this);
 441   },
 442
 443   camelize: function() {
 444     var parts = this.split('-'), len = parts.length;
 445     if (len == 1) return parts[0];
 446
 447     var camelized = this.charAt(0) == '-'
 448       ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
 449       : parts[0];
 450
 451     for (var i = 1; i < len; i++)
 452       camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
 453
 454     return camelized;
 455   },
 456
 457   capitalize: function() {
 458     return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
 459   },
 460
 461   underscore: function() {
 462     return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
 463   },
 464
 465   dasherize: function() {
 466     return this.gsub(/_/,'-');
 467   },
 468
 469   inspect: function(useDoubleQuotes) {
 470     var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
 471       var character = String.specialChar[match[0]];
 472       return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
 473     });
 474     if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
 475     return "'" + escapedString.replace(/'/g, '\\\'') + "'";
 476   },
 477
 478   toJSON: function() {
 479     return this.inspect(true);
 480   },
 481
 482   unfilterJSON: function(filter) {
 483     return this.sub(filter || Prototype.JSONFilter, '#{1}');
 484   },
 485
 486   isJSON: function() {
 487     var str = this;
 488     if (str.blank()) return false;
 489     str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
 490     return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
 491   },
 492
 493   evalJSON: function(sanitize) {
 494     var json = this.unfilterJSON();
 495     try {
 496       if (!sanitize || json.isJSON()) return eval('(' + json + ')');
 497     } catch (e) { }
 498     throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
 499   },
 500
 501   include: function(pattern) {
 502     return this.indexOf(pattern) > -1;
 503   },
 504
 505   startsWith: function(pattern) {
 506     return this.indexOf(pattern) === 0;
 507   },
 508
 509   endsWith: function(pattern) {
 510     var d = this.length - pattern.length;
 511     return d >= 0 && this.lastIndexOf(pattern) === d;
 512   },
 513
 514   empty: function() {
 515     return this == '';
 516   },
 517
 518   blank: function() {
 519     return /^\s*$/.test(this);
 520   },
 521
 522   interpolate: function(object, pattern) {
 523     return new Template(this, pattern).evaluate(object);
 524   }
 525 });
 526
 527 if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
 528   escapeHTML: function() {
 529     return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
 530   },
 531   unescapeHTML: function() {
 532     return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
 533   }
 534 });
 535
 536 String.prototype.gsub.prepareReplacement = function(replacement) {
 537   if (Object.isFunction(replacement)) return replacement;
 538   var template = new Template(replacement);
 539   return function(match) { return template.evaluate(match) };
 540 };
 541
 542 String.prototype.parseQuery = String.prototype.toQueryParams;
 543
 544 Object.extend(String.prototype.escapeHTML, {
 545   div:  document.createElement('div'),
 546   text: document.createTextNode('')
 547 });
 548
 549 with (String.prototype.escapeHTML) div.appendChild(text);
 550
 551 var Template = Class.create({
 552   initialize: function(template, pattern) {
 553     this.template = template.toString();
 554     this.pattern = pattern || Template.Pattern;
 555   },
 556
 557   evaluate: function(object) {
 558     if (Object.isFunction(object.toTemplateReplacements))
 559       object = object.toTemplateReplacements();
 560
 561     return this.template.gsub(this.pattern, function(match) {
 562       if (object == null) return '';
 563
 564       var before = match[1] || '';
 565       if (before == '\\') return match[2];
 566
 567       var ctx = object, expr = match[3];
 568       var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
 569       match = pattern.exec(expr);
 570       if (match == null) return before;
 571
 572       while (match != null) {
 573         var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
 574         ctx = ctx[comp];
 575         if (null == ctx || '' == match[3]) break;
 576         expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
 577         match = pattern.exec(expr);
 578       }
 579
 580       return before + String.interpret(ctx);
 581     }.bind(this));
 582   }
 583 });
 584 Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
 585
 586 var $break = { };
 587
 588 var Enumerable = {
 589   each: function(iterator, context) {
 590     var index = 0;
 591     iterator = iterator.bind(context);
 592     try {
 593       this._each(function(value) {
 594         iterator(value, index++);
 595       });
 596     } catch (e) {
 597       if (e != $break) throw e;
 598     }
 599     return this;
 600   },
 601
 602   eachSlice: function(number, iterator, context) {
 603     iterator = iterator ? iterator.bind(context) : Prototype.K;
 604     var index = -number, slices = [], array = this.toArray();
 605     while ((index += number) < array.length)
 606       slices.push(array.slice(index, index+number));
 607     return slices.collect(iterator, context);
 608   },
 609
 610   all: function(iterator, context) {
 611     iterator = iterator ? iterator.bind(context) : Prototype.K;
 612     var result = true;
 613     this.each(function(value, index) {
 614       result = result && !!iterator(value, index);
 615       if (!result) throw $break;
 616     });
 617     return result;
 618   },
 619
 620   any: function(iterator, context) {
 621     iterator = iterator ? iterator.bind(context) : Prototype.K;
 622     var result = false;
 623     this.each(function(value, index) {
 624       if (result = !!iterator(value, index))
 625         throw $break;
 626     });
 627     return result;
 628   },
 629
 630   collect: function(iterator, context) {
 631     iterator = iterator ? iterator.bind(context) : Prototype.K;
 632     var results = [];
 633     this.each(function(value, index) {
 634       results.push(iterator(value, index));
 635     });
 636     return results;
 637   },
 638
 639   detect: function(iterator, context) {
 640     iterator = iterator.bind(context);
 641     var result;
 642     this.each(function(value, index) {
 643       if (iterator(value, index)) {
 644         result = value;
 645         throw $break;
 646       }
 647     });
 648     return result;
 649   },
 650
 651   findAll: function(iterator, context) {
 652     iterator = iterator.bind(context);
 653     var results = [];
 654     this.each(function(value, index) {
 655       if (iterator(value, index))
 656         results.push(value);
 657     });
 658     return results;
 659   },
 660
 661   grep: function(filter, iterator, context) {
 662     iterator = iterator ? iterator.bind(context) : Prototype.K;
 663     var results = [];
 664
 665     if (Object.isString(filter))
 666       filter = new RegExp(filter);
 667
 668     this.each(function(value, index) {
 669       if (filter.match(value))
 670         results.push(iterator(value, index));
 671     });
 672     return results;
 673   },
 674
 675   include: function(object) {
 676     if (Object.isFunction(this.indexOf))
 677       if (this.indexOf(object) != -1) return true;
 678
 679     var found = false;
 680     this.each(function(value) {
 681       if (value == object) {
 682         found = true;
 683         throw $break;
 684       }
 685     });
 686     return found;
 687   },
 688
 689   inGroupsOf: function(number, fillWith) {
 690     fillWith = Object.isUndefined(fillWith) ? null : fillWith;
 691     return this.eachSlice(number, function(slice) {
 692       while(slice.length < number) slice.push(fillWith);
 693       return slice;
 694     });
 695   },
 696
 697   inject: function(memo, iterator, context) {
 698     iterator = iterator.bind(context);
 699     this.each(function(value, index) {
 700       memo = iterator(memo, value, index);
 701     });
 702     return memo;
 703   },
 704
 705   invoke: function(method) {
 706     var args = $A(arguments).slice(1);
 707     return this.map(function(value) {
 708       return value[method].apply(value, args);
 709     });
 710   },
 711
 712   max: function(iterator, context) {
 713     iterator = iterator ? iterator.bind(context) : Prototype.K;
 714     var result;
 715     this.each(function(value, index) {
 716       value = iterator(value, index);
 717       if (result == null || value >= result)
 718         result = value;
 719     });
 720     return result;
 721   },
 722
 723   min: function(iterator, context) {
 724     iterator = iterator ? iterator.bind(context) : Prototype.K;
 725     var result;
 726     this.each(function(value, index) {
 727       value = iterator(value, index);
 728       if (result == null || value < result)
 729         result = value;
 730     });
 731     return result;
 732   },
 733
 734   partition: function(iterator, context) {
 735     iterator = iterator ? iterator.bind(context) : Prototype.K;
 736     var trues = [], falses = [];
 737     this.each(function(value, index) {
 738       (iterator(value, index) ?
 739         trues : falses).push(value);
 740     });
 741     return [trues, falses];
 742   },
 743
 744   pluck: function(property) {
 745     var results = [];
 746     this.each(function(value) {
 747       results.push(value[property]);
 748     });
 749     return results;
 750   },
 751
 752   reject: function(iterator, context) {
 753     iterator = iterator.bind(context);
 754     var results = [];
 755     this.each(function(value, index) {
 756       if (!iterator(value, index))
 757         results.push(value);
 758     });
 759     return results;
 760   },
 761
 762   sortBy: function(iterator, context) {
 763     iterator = iterator.bind(context);
 764     return this.map(function(value, index) {
 765       return {value: value, criteria: iterator(value, index)};
 766     }).sort(function(left, right) {
 767       var a = left.criteria, b = right.criteria;
 768       return a < b ? -1 : a > b ? 1 : 0;
 769     }).pluck('value');
 770   },
 771
 772   toArray: function() {
 773     return this.map();
 774   },
 775
 776   zip: function() {
 777     var iterator = Prototype.K, args = $A(arguments);
 778     if (Object.isFunction(args.last()))
 779       iterator = args.pop();
 780
 781     var collections = [this].concat(args).map($A);
 782     return this.map(function(value, index) {
 783       return iterator(collections.pluck(index));
 784     });
 785   },
 786
 787   size: function() {
 788     return this.toArray().length;
 789   },
 790
 791   inspect: function() {
 792     return '#<Enumerable:' + this.toArray().inspect() + '>';
 793   }
 794 };
 795
 796 Object.extend(Enumerable, {
 797   map:     Enumerable.collect,
 798   find:    Enumerable.detect,
 799   select:  Enumerable.findAll,
 800   filter:  Enumerable.findAll,
 801   member:  Enumerable.include,
 802   entries: Enumerable.toArray,
 803   every:   Enumerable.all,
 804   some:    Enumerable.any
 805 });
 806 function $A(iterable) {
 807   if (!iterable) return [];
 808   if (iterable.toArray) return iterable.toArray();
 809   var length = iterable.length, results = new Array(length);
 810   while (length--) results[length] = iterable[length];
 811   return results;
 812 }
 813
 814 if (Prototype.Browser.WebKit) {
 815   function $A(iterable) {
 816     if (!iterable) return [];
 817     if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
 818         iterable.toArray) return iterable.toArray();
 819     var length = iterable.length, results = new Array(length);
 820     while (length--) results[length] = iterable[length];
 821     return results;
 822   }
 823 }
 824
 825 Array.from = $A;
 826
 827 Object.extend(Array.prototype, Enumerable);
 828
 829 if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
 830
 831 Object.extend(Array.prototype, {
 832   _each: function(iterator) {
 833     for (var i = 0, length = this.length; i < length; i++)
 834       iterator(this[i]);
 835   },
 836
 837   clear: function() {
 838     this.length = 0;
 839     return this;
 840   },
 841
 842   first: function() {
 843     return this[0];
 844   },
 845
 846   last: function() {
 847     return this[this.length - 1];
 848   },
 849
 850   compact: function() {
 851     return this.select(function(value) {
 852       return value != null;
 853     });
 854   },
 855
 856   flatten: function() {
 857     return this.inject([], function(array, value) {
 858       return array.concat(Object.isArray(value) ?
 859         value.flatten() : [value]);
 860     });
 861   },
 862
 863   without: function() {
 864     var values = $A(arguments);
 865     return this.select(function(value) {
 866       return !values.include(value);
 867     });
 868   },
 869
 870   reverse: function(inline) {
 871     return (inline !== false ? this : this.toArray())._reverse();
 872   },
 873
 874   reduce: function() {
 875     return this.length > 1 ? this : this[0];
 876   },
 877
 878   uniq: function(sorted) {
 879     return this.inject([], function(array, value, index) {
 880       if (0 == index || (sorted ? array.last() != value : !array.include(value)))
 881         array.push(value);
 882       return array;
 883     });
 884   },
 885
 886   intersect: function(array) {
 887     return this.uniq().findAll(function(item) {
 888       return array.detect(function(value) { return item === value });
 889     });
 890   },
 891
 892   clone: function() {
 893     return [].concat(this);
 894   },
 895
 896   size: function() {
 897     return this.length;
 898   },
 899
 900   inspect: function() {
 901     return '[' + this.map(Object.inspect).join(', ') + ']';
 902   },
 903
 904   toJSON: function() {
 905     var results = [];
 906     this.each(function(object) {
 907       var value = Object.toJSON(object);
 908       if (!Object.isUndefined(value)) results.push(value);
 909     });
 910     return '[' + results.join(', ') + ']';
 911   }
 912 });
 913
 914 // use native browser JS 1.6 implementation if available
 915 if (Object.isFunction(Array.prototype.forEach))
 916   Array.prototype._each = Array.prototype.forEach;
 917
 918 if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
 919   i || (i = 0);
 920   var length = this.length;
 921   if (i < 0) i = length + i;
 922   for (; i < length; i++)
 923     if (this[i] === item) return i;
 924   return -1;
 925 };
 926
 927 if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
 928   i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
 929   var n = this.slice(0, i).reverse().indexOf(item);
 930   return (n < 0) ? n : i - n - 1;
 931 };
 932
 933 Array.prototype.toArray = Array.prototype.clone;
 934
 935 function $w(string) {
 936   if (!Object.isString(string)) return [];
 937   string = string.strip();
 938   return string ? string.split(/\s+/) : [];
 939 }
 940
 941 if (Prototype.Browser.Opera){
 942   Array.prototype.concat = function() {
 943     var array = [];
 944     for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
 945     for (var i = 0, length = arguments.length; i < length; i++) {
 946       if (Object.isArray(arguments[i])) {
 947         for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
 948           array.push(arguments[i][j]);
 949       } else {
 950         array.push(arguments[i]);
 951       }
 952     }
 953     return array;
 954   };
 955 }
 956 Object.extend(Number.prototype, {
 957   toColorPart: function() {
 958     return this.toPaddedString(2, 16);
 959   },
 960
 961   succ: function() {
 962     return this + 1;
 963   },
 964
 965   times: function(iterator) {
 966     $R(0, this, true).each(iterator);
 967     return this;
 968   },
 969
 970   toPaddedString: function(length, radix) {
 971     var string = this.toString(radix || 10);
 972     return '0'.times(length - string.length) + string;
 973   },
 974
 975   toJSON: function() {
 976     return isFinite(this) ? this.toString() : 'null';
 977   }
 978 });
 979
 980 $w('abs round ceil floor').each(function(method){
 981   Number.prototype[method] = Math[method].methodize();
 982 });
 983 function $H(object) {
 984   return new Hash(object);
 985 };
 986
 987 var Hash = Class.create(Enumerable, (function() {
 988
 989   function toQueryPair(key, value) {
 990     if (Object.isUndefined(value)) return key;
 991     return key + '=' + encodeURIComponent(String.interpret(value));
 992   }
 993
 994   return {
 995     initialize: function(object) {
 996       this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
 997     },
 998
 999     _each: function(iterator) {
1000       for (var key in this._object) {
1001         var value = this._object[key], pair = [key, value];
1002         pair.key = key;
1003         pair.value = value;
1004         iterator(pair);
1005       }
1006     },
1007
1008     set: function(key, value) {
1009       return this._object[key] = value;
1010     },
1011
1012     get: function(key) {
1013       return this._object[key];
1014     },
1015
1016     unset: function(key) {
1017       var value = this._object[key];
1018       delete this._object[key];
1019       return value;
1020     },
1021
1022     toObject: function() {
1023       return Object.clone(this._object);
1024     },
1025
1026     keys: function() {
1027       return this.pluck('key');
1028     },
1029
1030     values: function() {
1031       return this.pluck('value');
1032     },
1033
1034     index: function(value) {
1035       var match = this.detect(function(pair) {
1036         return pair.value === value;
1037       });
1038       return match && match.key;
1039     },
1040
1041     merge: function(object) {
1042       return this.clone().update(object);
1043     },
1044
1045     update: function(object) {
1046       return new Hash(object).inject(this, function(result, pair) {
1047         result.set(pair.key, pair.value);
1048         return result;
1049       });
1050     },
1051
1052     toQueryString: function() {
1053       return this.map(function(pair) {
1054         var key = encodeURIComponent(pair.key), values = pair.value;
1055
1056         if (values && typeof values == 'object') {
1057           if (Object.isArray(values))
1058             return values.map(toQueryPair.curry(key)).join('&');
1059         }
1060         return toQueryPair(key, values);
1061       }).join('&');
1062     },
1063
1064     inspect: function() {
1065       return '#<Hash:{' + this.map(function(pair) {
1066         return pair.map(Object.inspect).join(': ');
1067       }).join(', ') + '}>';
1068     },
1069
1070     toJSON: function() {
1071       return Object.toJSON(this.toObject());
1072     },
1073
1074     clone: function() {
1075       return new Hash(this);
1076     }
1077   }
1078 })());
1079
1080 Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
1081 Hash.from = $H;
1082 var ObjectRange = Class.create(Enumerable, {
1083   initialize: function(start, end, exclusive) {
1084     this.start = start;
1085     this.end = end;
1086     this.exclusive = exclusive;
1087   },
1088
1089   _each: function(iterator) {
1090     var value = this.start;
1091     while (this.include(value)) {
1092       iterator(value);
1093       value = value.succ();
1094     }
1095   },
1096
1097   include: function(value) {
1098     if (value < this.start)
1099       return false;
1100     if (this.exclusive)
1101       return value < this.end;
1102     return value <= this.end;
1103   }
1104 });
1105
1106 var $R = function(start, end, exclusive) {
1107   return new ObjectRange(start, end, exclusive);
1108 };
1109
1110 var Ajax = {
1111   getTransport: function() {
1112     return Try.these(
1113       function() {return new XMLHttpRequest()},
1114       function() {return new ActiveXObject('Msxml2.XMLHTTP')},
1115       function() {return new ActiveXObject('Microsoft.XMLHTTP')}
1116     ) || false;
1117   },
1118
1119   activeRequestCount: 0
1120 };
1121
1122 Ajax.Responders = {
1123   responders: [],
1124
1125   _each: function(iterator) {
1126     this.responders._each(iterator);
1127   },
1128
1129   register: function(responder) {
1130     if (!this.include(responder))
1131       this.responders.push(responder);
1132   },
1133
1134   unregister: function(responder) {
1135     this.responders = this.responders.without(responder);
1136   },
1137
1138   dispatch: function(callback, request, transport, json) {
1139     this.each(function(responder) {
1140       if (Object.isFunction(responder[callback])) {
1141         try {
1142           responder[callback].apply(responder, [request, transport, json]);
1143         } catch (e) { }
1144       }
1145     });
1146   }
1147 };
1148
1149 Object.extend(Ajax.Responders, Enumerable);
1150
1151 Ajax.Responders.register({
1152   onCreate:   function() { Ajax.activeRequestCount++ },
1153   onComplete: function() { Ajax.activeRequestCount-- }
1154 });
1155
1156 Ajax.Base = Class.create({
1157   initialize: function(options) {
1158     this.options = {
1159       method:       'post',
1160       asynchronous: true,
1161       contentType:  'application/x-www-form-urlencoded',
1162       encoding:     'UTF-8',
1163       parameters:   '',
1164       evalJSON:     true,
1165       evalJS:       true
1166     };
1167     Object.extend(this.options, options || { });
1168
1169     this.options.method = this.options.method.toLowerCase();
1170
1171     if (Object.isString(this.options.parameters))
1172       this.options.parameters = this.options.parameters.toQueryParams();
1173     else if (Object.isHash(this.options.parameters))
1174       this.options.parameters = this.options.parameters.toObject();
1175   }
1176 });
1177
1178 Ajax.Request = Class.create(Ajax.Base, {
1179   _complete: false,
1180
1181   initialize: function($super, url, options) {
1182     $super(options);
1183     this.transport = Ajax.getTransport();
1184     this.request(url);
1185   },
1186
1187   request: function(url) {
1188     this.url = url;
1189     this.method = this.options.method;
1190     var params = Object.clone(this.options.parameters);
1191
1192     if (!['get', 'post'].include(this.method)) {
1193       // simulate other verbs over post
1194       params['_method'] = this.method;
1195       this.method = 'post';
1196     }
1197
1198     this.parameters = params;
1199
1200     if (params = Object.toQueryString(params)) {
1201       // when GET, append parameters to URL
1202       if (this.method == 'get')
1203         this.url += (this.url.include('?') ? '&' : '?') + params;
1204       else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
1205         params += '&_=';
1206     }
1207
1208     try {
1209       var response = new Ajax.Response(this);
1210       if (this.options.onCreate) this.options.onCreate(response);
1211       Ajax.Responders.dispatch('onCreate', this, response);
1212
1213       this.transport.open(this.method.toUpperCase(), this.url,
1214         this.options.asynchronous);
1215
1216       if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
1217
1218       this.transport.onreadystatechange = this.onStateChange.bind(this);
1219       this.setRequestHeaders();
1220
1221       this.body = this.method == 'post' ? (this.options.postBody || params) : null;
1222       this.transport.send(this.body);
1223
1224       /* Force Firefox to handle ready state 4 for synchronous requests */
1225       if (!this.options.asynchronous && this.transport.overrideMimeType)
1226         this.onStateChange();
1227
1228     }
1229     catch (e) {
1230       this.dispatchException(e);
1231     }
1232   },
1233
1234   onStateChange: function() {
1235     var readyState = this.transport.readyState;
1236     if (readyState > 1 && !((readyState == 4) && this._complete))
1237       this.respondToReadyState(this.transport.readyState);
1238   },
1239
1240   setRequestHeaders: function() {
1241     var headers = {
1242       'X-Requested-With': 'XMLHttpRequest',
1243       'X-Prototype-Version': Prototype.Version,
1244       'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
1245     };
1246
1247     if (this.method == 'post') {
1248       headers['Content-type'] = this.options.contentType +
1249         (this.options.encoding ? '; charset=' + this.options.encoding : '');
1250
1251       /* Force "Connection: close" for older Mozilla browsers to work
1252        * around a bug where XMLHttpRequest sends an incorrect
1253        * Content-length header. See Mozilla Bugzilla #246651.
1254        */
1255       if (this.transport.overrideMimeType &&
1256           (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
1257             headers['Connection'] = 'close';
1258     }
1259
1260     // user-defined headers
1261     if (typeof this.options.requestHeaders == 'object') {
1262       var extras = this.options.requestHeaders;
1263
1264       if (Object.isFunction(extras.push))
1265         for (var i = 0, length = extras.length; i < length; i += 2)
1266           headers[extras[i]] = extras[i+1];
1267       else
1268         $H(extras).each(function(pair) { headers[pair.key] = pair.value });
1269     }
1270
1271     for (var name in headers)
1272       this.transport.setRequestHeader(name, headers[name]);
1273   },
1274
1275   success: function() {
1276     var status = this.getStatus();
1277     return !status || (status >= 200 && status < 300);
1278   },
1279
1280   getStatus: function() {
1281     try {
1282       return this.transport.status || 0;
1283     } catch (e) { return 0 }
1284   },
1285
1286   respondToReadyState: function(readyState) {
1287     var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
1288
1289     if (state == 'Complete') {
1290       try {
1291         this._complete = true;
1292         (this.options['on' + response.status]
1293          || this.options['on' + (this.success() ? 'Success' : 'Failure')]
1294          || Prototype.emptyFunction)(response, response.headerJSON);
1295       } catch (e) {
1296         this.dispatchException(e);
1297       }
1298
1299       var contentType = response.getHeader('Content-type');
1300       if (this.options.evalJS == 'force'
1301           || (this.options.evalJS && contentType
1302           && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
1303         this.evalResponse();
1304     }
1305
1306     try {
1307       (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
1308       Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
1309     } catch (e) {
1310       this.dispatchException(e);
1311     }
1312
1313     if (state == 'Complete') {
1314       // avoid memory leak in MSIE: clean up
1315       this.transport.onreadystatechange = Prototype.emptyFunction;
1316     }
1317   },
1318
1319   getHeader: function(name) {
1320     try {
1321       return this.transport.getResponseHeader(name);
1322     } catch (e) { return null }
1323   },
1324
1325   evalResponse: function() {
1326     try {
1327       return eval((this.transport.responseText || '').unfilterJSON());
1328     } catch (e) {
1329       this.dispatchException(e);
1330     }
1331   },
1332
1333   dispatchException: function(exception) {
1334     (this.options.onException || Prototype.emptyFunction)(this, exception);
1335     Ajax.Responders.dispatch('onException', this, exception);
1336   }
1337 });
1338
1339 Ajax.Request.Events =
1340   ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
1341
1342 Ajax.Response = Class.create({
1343   initialize: function(request){
1344     this.request = request;
1345     var transport  = this.transport  = request.transport,
1346         readyState = this.readyState = transport.readyState;
1347
1348     if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
1349       this.status       = this.getStatus();
1350       this.statusText   = this.getStatusText();
1351       this.responseText = String.interpret(transport.responseText);
1352       this.headerJSON   = this._getHeaderJSON();
1353     }
1354
1355     if(readyState == 4) {
1356       var xml = transport.responseXML;
1357       this.responseXML  = Object.isUndefined(xml) ? null : xml;
1358       this.responseJSON = this._getResponseJSON();
1359     }
1360   },
1361
1362   status:      0,
1363   statusText: '',
1364
1365   getStatus: Ajax.Request.prototype.getStatus,
1366
1367   getStatusText: function() {
1368     try {
1369       return this.transport.statusText || '';
1370     } catch (e) { return '' }
1371   },
1372
1373   getHeader: Ajax.Request.prototype.getHeader,
1374
1375   getAllHeaders: function() {
1376     try {
1377       return this.getAllResponseHeaders();
1378     } catch (e) { return null }
1379   },
1380
1381   getResponseHeader: function(name) {
1382     return this.transport.getResponseHeader(name);
1383   },
1384
1385   getAllResponseHeaders: function() {
1386     return this.transport.getAllResponseHeaders();
1387   },
1388
1389   _getHeaderJSON: function() {
1390     var json = this.getHeader('X-JSON');
1391     if (!json) return null;
1392     json = decodeURIComponent(escape(json));
1393     try {
1394       return json.evalJSON(this.request.options.sanitizeJSON);
1395     } catch (e) {
1396       this.request.dispatchException(e);
1397     }
1398   },
1399
1400   _getResponseJSON: function() {
1401     var options = this.request.options;
1402     if (!options.evalJSON || (options.evalJSON != 'force' &&
1403       !(this.getHeader('Content-type') || '').include('application/json')) ||
1404         this.responseText.blank())
1405           return null;
1406     try {
1407       return this.responseText.evalJSON(options.sanitizeJSON);
1408     } catch (e) {
1409       this.request.dispatchException(e);
1410     }
1411   }
1412 });
1413
1414 Ajax.Updater = Class.create(Ajax.Request, {
1415   initialize: function($super, container, url, options) {
1416     this.container = {
1417       success: (container.success || container),
1418       failure: (container.failure || (container.success ? null : container))
1419     };
1420
1421     options = Object.clone(options);
1422     var onComplete = options.onComplete;
1423     options.onComplete = (function(response, json) {
1424       this.updateContent(response.responseText);
1425       if (Object.isFunction(onComplete)) onComplete(response, json);
1426     }).bind(this);
1427
1428     $super(url, options);
1429   },
1430
1431   updateContent: function(responseText) {
1432     var receiver = this.container[this.success() ? 'success' : 'failure'],
1433         options = this.options;
1434
1435     if (!options.evalScripts) responseText = responseText.stripScripts();
1436
1437     if (receiver = $(receiver)) {
1438       if (options.insertion) {
1439         if (Object.isString(options.insertion)) {
1440           var insertion = { }; insertion[options.insertion] = responseText;
1441           receiver.insert(insertion);
1442         }
1443         else options.insertion(receiver, responseText);
1444       }
1445       else receiver.update(responseText);
1446     }
1447   }
1448 });
1449
1450 Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
1451   initialize: function($super, container, url, options) {
1452     $super(options);
1453     this.onComplete = this.options.onComplete;
1454
1455     this.frequency = (this.options.frequency || 2);
1456     this.decay = (this.options.decay || 1);
1457
1458     this.updater = { };
1459     this.container = container;
1460     this.url = url;
1461
1462     this.start();
1463   },
1464
1465   start: function() {
1466     this.options.onComplete = this.updateComplete.bind(this);
1467     this.onTimerEvent();
1468   },
1469
1470   stop: function() {
1471     this.updater.options.onComplete = undefined;
1472     clearTimeout(this.timer);
1473     (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
1474   },
1475
1476   updateComplete: function(response) {
1477     if (this.options.decay) {
1478       this.decay = (response.responseText == this.lastText ?
1479         this.decay * this.options.decay : 1);
1480
1481       this.lastText = response.responseText;
1482     }
1483     this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
1484   },
1485
1486   onTimerEvent: function() {
1487     this.updater = new Ajax.Updater(this.container, this.url, this.options);
1488   }
1489 });
1490 function $(element) {
1491   if (arguments.length > 1) {
1492     for (var i = 0, elements = [], length = arguments.length; i < length; i++)
1493       elements.push($(arguments[i]));
1494     return elements;
1495   }
1496   if (Object.isString(element))
1497     element = document.getElementById(element);
1498   return Element.extend(element);
1499 }
1500
1501 if (Prototype.BrowserFeatures.XPath) {
1502   document._getElementsByXPath = function(expression, parentElement) {
1503     var results = [];
1504     var query = document.evaluate(expression, $(parentElement) || document,
1505       null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
1506     for (var i = 0, length = query.snapshotLength; i < length; i++)
1507       results.push(Element.extend(query.snapshotItem(i)));
1508     return results;
1509   };
1510 }
1511
1512 /*--------------------------------------------------------------------------*/
1513
1514 if (!window.Node) var Node = { };
1515
1516 if (!Node.ELEMENT_NODE) {
1517   // DOM level 2 ECMAScript Language Binding
1518   Object.extend(Node, {
1519     ELEMENT_NODE: 1,
1520     ATTRIBUTE_NODE: 2,
1521     TEXT_NODE: 3,
1522     CDATA_SECTION_NODE: 4,
1523     ENTITY_REFERENCE_NODE: 5,
1524     ENTITY_NODE: 6,
1525     PROCESSING_INSTRUCTION_NODE: 7,
1526     COMMENT_NODE: 8,
1527     DOCUMENT_NODE: 9,
1528     DOCUMENT_TYPE_NODE: 10,
1529     DOCUMENT_FRAGMENT_NODE: 11,
1530     NOTATION_NODE: 12
1531   });
1532 }
1533
1534 (function() {
1535   var element = this.Element;
1536   this.Element = function(tagName, attributes) {
1537     attributes = attributes || { };
1538     tagName = tagName.toLowerCase();
1539     var cache = Element.cache;
1540     if (Prototype.Browser.IE && attributes.name) {
1541       tagName = '<' + tagName + ' name="' + attributes.name + '">';
1542       delete attributes.name;
1543       return Element.writeAttribute(document.createElement(tagName), attributes);
1544     }
1545     if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
1546     return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
1547   };
1548   Object.extend(this.Element, element || { });
1549 }).call(window);
1550
1551 Element.cache = { };
1552
1553 Element.Methods = {
1554   visible: function(element) {
1555     return $(element).style.display != 'none';
1556   },
1557
1558   toggle: function(element) {
1559     element = $(element);
1560     Element[Element.visible(element) ? 'hide' : 'show'](element);
1561     return element;
1562   },
1563
1564   hide: function(element) {
1565     $(element).style.display = 'none';
1566     return element;
1567   },
1568
1569   show: function(element) {
1570     $(element).style.display = '';
1571     return element;
1572   },
1573
1574   remove: function(element) {
1575     element = $(element);
1576     element.parentNode.removeChild(element);
1577     return element;
1578   },
1579
1580   update: function(element, content) {
1581     element = $(element);
1582     if (content && content.toElement) content = content.toElement();
1583     if (Object.isElement(content)) return element.update().insert(content);
1584     content = Object.toHTML(content);
1585     element.innerHTML = content.stripScripts();
1586     content.evalScripts.bind(content).defer();
1587     return element;
1588   },
1589
1590   replace: function(element, content) {
1591     element = $(element);
1592     if (content && content.toElement) content = content.toElement();
1593     else if (!Object.isElement(content)) {
1594       content = Object.toHTML(content);
1595       var range = element.ownerDocument.createRange();
1596       range.selectNode(element);
1597       content.evalScripts.bind(content).defer();
1598       content = range.createContextualFragment(content.stripScripts());
1599     }
1600     element.parentNode.replaceChild(content, element);
1601     return element;
1602   },
1603
1604   insert: function(element, insertions) {
1605     element = $(element);
1606
1607     if (Object.isString(insertions) || Object.isNumber(insertions) ||
1608         Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
1609           insertions = {bottom:insertions};
1610
1611     var content, t, range;
1612
1613     for (position in insertions) {
1614       content  = insertions[position];
1615       position = position.toLowerCase();
1616       t = Element._insertionTranslations[position];
1617
1618       if (content && content.toElement) content = content.toElement();
1619       if (Object.isElement(content)) {
1620         t.insert(element, content);
1621         continue;
1622       }
1623
1624       content = Object.toHTML(content);
1625
1626       range = element.ownerDocument.createRange();
1627       t.initializeRange(element, range);
1628       t.insert(element, range.createContextualFragment(content.stripScripts()));
1629
1630       content.evalScripts.bind(content).defer();
1631     }
1632
1633     return element;
1634   },
1635
1636   wrap: function(element, wrapper, attributes) {
1637     element = $(element);
1638     if (Object.isElement(wrapper))
1639       $(wrapper).writeAttribute(attributes || { });
1640     else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
1641     else wrapper = new Element('div', wrapper);
1642     if (element.parentNode)
1643       element.parentNode.replaceChild(wrapper, element);
1644     wrapper.appendChild(element);
1645     return wrapper;
1646   },
1647
1648   inspect: function(element) {
1649     element = $(element);
1650     var result = '<' + element.tagName.toLowerCase();
1651     $H({'id': 'id', 'className': 'class'}).each(function(pair) {
1652       var property = pair.first(), attribute = pair.last();
1653       var value = (element[property] || '').toString();
1654       if (value) result += ' ' + attribute + '=' + value.inspect(true);
1655     });
1656     return result + '>';
1657   },
1658
1659   recursivelyCollect: function(element, property) {
1660     element = $(element);
1661     var elements = [];
1662     while (element = element[property])
1663       if (element.nodeType == 1)
1664         elements.push(Element.extend(element));
1665     return elements;
1666   },
1667
1668   ancestors: function(element) {
1669     return $(element).recursivelyCollect('parentNode');
1670   },
1671
1672   descendants: function(element) {
1673     return $(element).getElementsBySelector("*");
1674   },
1675
1676   firstDescendant: function(element) {
1677     element = $(element).firstChild;
1678     while (element && element.nodeType != 1) element = element.nextSibling;
1679     return $(element);
1680   },
1681
1682   immediateDescendants: function(element) {
1683     if (!(element = $(element).firstChild)) return [];
1684     while (element && element.nodeType != 1) element = element.nextSibling;
1685     if (element) return [element].concat($(element).nextSiblings());
1686     return [];
1687   },
1688
1689   previousSiblings: function(element) {
1690     return $(element).recursivelyCollect('previousSibling');
1691   },
1692
1693   nextSiblings: function(element) {
1694     return $(element).recursivelyCollect('nextSibling');
1695   },
1696
1697   siblings: function(element) {
1698     element = $(element);
1699     return element.previousSiblings().reverse().concat(element.nextSiblings());
1700   },
1701
1702   match: function(element, selector) {
1703     if (Object.isString(selector))
1704       selector = new Selector(selector);
1705     return selector.match($(element));
1706   },
1707
1708   up: function(element, expression, index) {
1709     element = $(element);
1710     if (arguments.length == 1) return $(element.parentNode);
1711     var ancestors = element.ancestors();
1712     return expression ? Selector.findElement(ancestors, expression, index) :
1713       ancestors[index || 0];
1714   },
1715
1716   down: function(element, expression, index) {
1717     element = $(element);
1718     if (arguments.length == 1) return element.firstDescendant();
1719     var descendants = element.descendants();
1720     return expression ? Selector.findElement(descendants, expression, index) :
1721       descendants[index || 0];
1722   },
1723
1724   previous: function(element, expression, index) {
1725     element = $(element);
1726     if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
1727     var previousSiblings = element.previousSiblings();
1728     return expression ? Selector.findElement(previousSiblings, expression, index) :
1729       previousSiblings[index || 0];
1730   },
1731
1732   next: function(element, expression, index) {
1733     element = $(element);
1734     if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
1735     var nextSiblings = element.nextSiblings();
1736     return expression ? Selector.findElement(nextSiblings, expression, index) :
1737       nextSiblings[index || 0];
1738   },
1739
1740   select: function() {
1741     var args = $A(arguments), element = $(args.shift());
1742     return Selector.findChildElements(element, args);
1743   },
1744
1745   adjacent: function() {
1746     var args = $A(arguments), element = $(args.shift());
1747     return Selector.findChildElements(element.parentNode, args).without(element);
1748   },
1749
1750   identify: function(element) {
1751     element = $(element);
1752     var id = element.readAttribute('id'), self = arguments.callee;
1753     if (id) return id;
1754     do { id = 'anonymous_element_' + self.counter++ } while ($(id));
1755     element.writeAttribute('id', id);
1756     return id;
1757   },
1758
1759   readAttribute: function(element, name) {
1760     element = $(element);
1761     if (Prototype.Browser.IE) {
1762       var t = Element._attributeTranslations.read;
1763       if (t.values[name]) return t.values[name](element, name);
1764       if (t.names[name]) name = t.names[name];
1765       if (name.include(':')) {
1766         return (!element.attributes || !element.attributes[name]) ? null :
1767          element.attributes[name].value;
1768       }
1769     }
1770     return element.getAttribute(name);
1771   },
1772
1773   writeAttribute: function(element, name, value) {
1774     element = $(element);
1775     var attributes = { }, t = Element._attributeTranslations.write;
1776
1777     if (typeof name == 'object') attributes = name;
1778     else attributes[name] = Object.isUndefined(value) ? true : value;
1779
1780     for (var attr in attributes) {
1781       name = t.names[attr] || attr;
1782       value = attributes[attr];
1783       if (t.values[attr]) name = t.values[attr](element, value);
1784       if (value === false || value === null)
1785         element.removeAttribute(name);
1786       else if (value === true)
1787         element.setAttribute(name, name);
1788       else element.setAttribute(name, value);
1789     }
1790     return element;
1791   },
1792
1793   getHeight: function(element) {
1794     return $(element).getDimensions().height;
1795   },
1796
1797   getWidth: function(element) {
1798     return $(element).getDimensions().width;
1799   },
1800
1801   classNames: function(element) {
1802     return new Element.ClassNames(element);
1803   },
1804
1805   hasClassName: function(element, className) {
1806     if (!(element = $(element))) return;
1807     var elementClassName = element.className;
1808     return (elementClassName.length > 0 && (elementClassName == className ||
1809       new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
1810   },
1811
1812   addClassName: function(element, className) {
1813     if (!(element = $(element))) return;
1814     if (!element.hasClassName(className))
1815       element.className += (element.className ? ' ' : '') + className;
1816     return element;
1817   },
1818
1819   removeClassName: function(element, className) {
1820     if (!(element = $(element))) return;
1821     element.className = element.className.replace(
1822       new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
1823     return element;
1824   },
1825
1826   toggleClassName: function(element, className) {
1827     if (!(element = $(element))) return;
1828     return element[element.hasClassName(className) ?
1829       'removeClassName' : 'addClassName'](className);
1830   },
1831
1832   // removes whitespace-only text node children
1833   cleanWhitespace: function(element) {
1834     element = $(element);
1835     var node = element.firstChild;
1836     while (node) {
1837       var nextNode = node.nextSibling;
1838       if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
1839         element.removeChild(node);
1840       node = nextNode;
1841     }
1842     return element;
1843   },
1844
1845   empty: function(element) {
1846     return $(element).innerHTML.blank();
1847   },
1848
1849   descendantOf: function(element, ancestor) {
1850     element = $(element), ancestor = $(ancestor);
1851     var originalAncestor = ancestor;
1852
1853     if (element.compareDocumentPosition)
1854       return (element.compareDocumentPosition(ancestor) & 8) === 8;
1855
1856     if (element.sourceIndex && !Prototype.Browser.Opera) {
1857       var e = element.sourceIndex, a = ancestor.sourceIndex,
1858        nextAncestor = ancestor.nextSibling;
1859       if (!nextAncestor) {
1860         do { ancestor = ancestor.parentNode; }
1861         while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
1862       }
1863       if (nextAncestor) return (e > a && e < nextAncestor.sourceIndex);
1864     }
1865
1866     while (element = element.parentNode)
1867       if (element == originalAncestor) return true;
1868     return false;
1869   },
1870
1871   scrollTo: function(element) {
1872     element = $(element);
1873     var pos = element.cumulativeOffset();
1874     window.scrollTo(pos[0], pos[1]);
1875     return element;
1876   },
1877
1878   getStyle: function(element, style) {
1879     element = $(element);
1880     style = style == 'float' ? 'cssFloat' : style.camelize();
1881     var value = element.style[style];
1882     if (!value) {
1883       var css = document.defaultView.getComputedStyle(element, null);
1884       value = css ? css[style] : null;
1885     }
1886     if (style == 'opacity') return value ? parseFloat(value) : 1.0;
1887     return value == 'auto' ? null : value;
1888   },
1889
1890   getOpacity: function(element) {
1891     return $(element).getStyle('opacity');
1892   },
1893
1894   setStyle: function(element, styles) {
1895     element = $(element);
1896     var elementStyle = element.style, match;
1897     if (Object.isString(styles)) {
1898       element.style.cssText += ';' + styles;
1899       return styles.include('opacity') ?
1900         element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
1901     }
1902     for (var property in styles)
1903       if (property == 'opacity') element.setOpacity(styles[property]);
1904       else
1905         elementStyle[(property == 'float' || property == 'cssFloat') ?
1906           (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
1907             property] = styles[property];
1908
1909     return element;
1910   },
1911
1912   setOpacity: function(element, value) {
1913     element = $(element);
1914     element.style.opacity = (value == 1 || value === '') ? '' :
1915       (value < 0.00001) ? 0 : value;
1916     return element;
1917   },
1918
1919   getDimensions: function(element) {
1920     element = $(element);
1921     var display = $(element).getStyle('display');
1922     if (display != 'none' && display != null) // Safari bug
1923       return {width: element.offsetWidth, height: element.offsetHeight};
1924
1925     // All *Width and *Height properties give 0 on elements with display none,
1926     // so enable the element temporarily
1927     var els = element.style;
1928     var originalVisibility = els.visibility;
1929     var originalPosition = els.position;
1930     var originalDisplay = els.display;
1931     els.visibility = 'hidden';
1932     els.position = 'absolute';
1933     els.display = 'block';
1934     var originalWidth = element.clientWidth;
1935     var originalHeight = element.clientHeight;
1936     els.display = originalDisplay;
1937     els.position = originalPosition;
1938     els.visibility = originalVisibility;
1939     return {width: originalWidth, height: originalHeight};
1940   },
1941
1942   makePositioned: function(element) {
1943     element = $(element);
1944     var pos = Element.getStyle(element, 'position');
1945     if (pos == 'static' || !pos) {
1946       element._madePositioned = true;
1947       element.style.position = 'relative';
1948       // Opera returns the offset relative to the positioning context, when an
1949       // element is position relative but top and left have not been defined
1950       if (window.opera) {
1951         element.style.top = 0;
1952         element.style.left = 0;
1953       }
1954     }
1955     return element;
1956   },
1957
1958   undoPositioned: function(element) {
1959     element = $(element);
1960     if (element._madePositioned) {
1961       element._madePositioned = undefined;
1962       element.style.position =
1963         element.style.top =
1964         element.style.left =
1965         element.style.bottom =
1966         element.style.right = '';
1967     }
1968     return element;
1969   },
1970
1971   makeClipping: function(element) {
1972     element = $(element);
1973     if (element._overflow) return element;
1974     element._overflow = Element.getStyle(element, 'overflow') || 'auto';
1975     if (element._overflow !== 'hidden')
1976       element.style.overflow = 'hidden';
1977     return element;
1978   },
1979
1980   undoClipping: function(element) {
1981     element = $(element);
1982     if (!element._overflow) return element;
1983     element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
1984     element._overflow = null;
1985     return element;
1986   },
1987
1988   cumulativeOffset: function(element) {
1989     var valueT = 0, valueL = 0;
1990     do {
1991       valueT += element.offsetTop  || 0;
1992       valueL += element.offsetLeft || 0;
1993       element = element.offsetParent;
1994     } while (element);
1995     return Element._returnOffset(valueL, valueT);
1996   },
1997
1998   positionedOffset: function(element) {
1999     var valueT = 0, valueL = 0;
2000     do {
2001       valueT += element.offsetTop  || 0;
2002       valueL += element.offsetLeft || 0;
2003       element = element.offsetParent;
2004       if (element) {
2005         if (element.tagName == 'BODY') break;
2006         var p = Element.getStyle(element, 'position');
2007         if (p == 'relative' || p == 'absolute') break;
2008       }
2009     } while (element);
2010     return Element._returnOffset(valueL, valueT);
2011   },
2012
2013   absolutize: function(element) {
2014     element = $(element);
2015     if (element.getStyle('position') == 'absolute') return;
2016     // Position.prepare(); // To be done manually by Scripty when it needs it.
2017
2018     var offsets = element.positionedOffset();
2019     var top     = offsets[1];
2020     var left    = offsets[0];
2021     var width   = element.clientWidth;
2022     var height  = element.clientHeight;
2023
2024     element._originalLeft   = left - parseFloat(element.style.left  || 0);
2025     element._originalTop    = top  - parseFloat(element.style.top || 0);
2026     element._originalWidth  = element.style.width;
2027     element._originalHeight = element.style.height;
2028
2029     element.style.position = 'absolute';
2030     element.style.top    = top + 'px';
2031     element.style.left   = left + 'px';
2032     element.style.width  = width + 'px';
2033     element.style.height = height + 'px';
2034     return element;
2035   },
2036
2037   relativize: function(element) {
2038     element = $(element);
2039     if (element.getStyle('position') == 'relative') return;
2040     // Position.prepare(); // To be done manually by Scripty when it needs it.
2041
2042     element.style.position = 'relative';
2043     var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
2044     var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
2045
2046     element.style.top    = top + 'px';
2047     element.style.left   = left + 'px';
2048     element.style.height = element._originalHeight;
2049     element.style.width  = element._originalWidth;
2050     return element;
2051   },
2052
2053   cumulativeScrollOffset: function(element) {
2054     var valueT = 0, valueL = 0;
2055     do {
2056       valueT += element.scrollTop  || 0;
2057       valueL += element.scrollLeft || 0;
2058       element = element.parentNode;
2059     } while (element);
2060     return Element._returnOffset(valueL, valueT);
2061   },
2062
2063   getOffsetParent: function(element) {
2064     if (element.offsetParent) return $(element.offsetParent);
2065     if (element == document.body) return $(element);
2066
2067     while ((element = element.parentNode) && element != document.body)
2068       if (Element.getStyle(element, 'position') != 'static')
2069         return $(element);
2070
2071     return $(document.body);
2072   },
2073
2074   viewportOffset: function(forElement) {
2075     var valueT = 0, valueL = 0;
2076
2077     var element = forElement;
2078     do {
2079       valueT += element.offsetTop  || 0;
2080       valueL += element.offsetLeft || 0;
2081
2082       // Safari fix
2083       if (element.offsetParent == document.body &&
2084         Element.getStyle(element, 'position') == 'absolute') break;
2085
2086     } while (element = element.offsetParent);
2087
2088     element = forElement;
2089     do {
2090       if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
2091         valueT -= element.scrollTop  || 0;
2092         valueL -= element.scrollLeft || 0;
2093       }
2094     } while (element = element.parentNode);
2095
2096     return Element._returnOffset(valueL, valueT);
2097   },
2098
2099   clonePosition: function(element, source) {
2100     var options = Object.extend({
2101       setLeft:    true,
2102       setTop:     true,
2103       setWidth:   true,
2104       setHeight:  true,
2105       offsetTop:  0,
2106       offsetLeft: 0
2107     }, arguments[2] || { });
2108
2109     // find page position of source
2110     source = $(source);
2111     var p = source.viewportOffset();
2112
2113     // find coordinate system to use
2114     element = $(element);
2115     var delta = [0, 0];
2116     var parent = null;
2117     // delta [0,0] will do fine with position: fixed elements,
2118     // position:absolute needs offsetParent deltas
2119     if (Element.getStyle(element, 'position') == 'absolute') {
2120       parent = element.getOffsetParent();
2121       delta = parent.viewportOffset();
2122     }
2123
2124     // correct by body offsets (fixes Safari)
2125     if (parent == document.body) {
2126       delta[0] -= document.body.offsetLeft;
2127       delta[1] -= document.body.offsetTop;
2128     }
2129
2130     // set position
2131     if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
2132     if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
2133     if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
2134     if (options.setHeight) element.style.height = source.offsetHeight + 'px';
2135     return element;
2136   }
2137 };
2138
2139 Element.Methods.identify.counter = 1;
2140
2141 Object.extend(Element.Methods, {
2142   getElementsBySelector: Element.Methods.select,
2143   childElements: Element.Methods.immediateDescendants
2144 });
2145
2146 Element._attributeTranslations = {
2147   write: {
2148     names: {
2149       className: 'class',
2150       htmlFor:   'for'
2151     },
2152     values: { }
2153   }
2154 };
2155
2156
2157 if (!document.createRange || Prototype.Browser.Opera) {
2158   Element.Methods.insert = function(element, insertions) {
2159     element = $(element);
2160
2161     if (Object.isString(insertions) || Object.isNumber(insertions) ||
2162         Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
2163           insertions = { bottom: insertions };
2164
2165     var t = Element._insertionTranslations, content, position, pos, tagName;
2166
2167     for (position in insertions) {
2168       content  = insertions[position];
2169       position = position.toLowerCase();
2170       pos      = t[position];
2171
2172       if (content && content.toElement) content = content.toElement();
2173       if (Object.isElement(content)) {
2174         pos.insert(element, content);
2175         continue;
2176       }
2177
2178       content = Object.toHTML(content);
2179       tagName = ((position == 'before' || position == 'after')
2180         ? element.parentNode : element).tagName.toUpperCase();
2181
2182       if (t.tags[tagName]) {
2183         var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
2184         if (position == 'top' || position == 'after') fragments.reverse();
2185         fragments.each(pos.insert.curry(element));
2186       }
2187       else element.insertAdjacentHTML(pos.adjacency, content.stripScripts());
2188
2189       content.evalScripts.bind(content).defer();
2190     }
2191
2192     return element;
2193   };
2194 }
2195
2196 if (Prototype.Browser.Opera) {
2197   Element.Methods.getStyle = Element.Methods.getStyle.wrap(
2198     function(proceed, element, style) {
2199       switch (style) {
2200         case 'left': case 'top': case 'right': case 'bottom':
2201           if (proceed(element, 'position') === 'static') return null;
2202         case 'height': case 'width':
2203           // returns '0px' for hidden elements; we want it to return null
2204           if (!Element.visible(element)) return null;
2205
2206           // returns the border-box dimensions rather than the content-box
2207           // dimensions, so we subtract padding and borders from the value
2208           var dim = parseInt(proceed(element, style), 10);
2209
2210           if (dim !== element['offset' + style.capitalize()])
2211             return dim + 'px';
2212
2213           var properties;
2214           if (style === 'height') {
2215             properties = ['border-top-width', 'padding-top',
2216              'padding-bottom', 'border-bottom-width'];
2217           }
2218           else {
2219             properties = ['border-left-width', 'padding-left',
2220              'padding-right', 'border-right-width'];
2221           }
2222           return properties.inject(dim, function(memo, property) {
2223             var val = proceed(element, property);
2224             return val === null ? memo : memo - parseInt(val, 10);
2225           }) + 'px';
2226         default: return proceed(element, style);
2227       }
2228     }
2229   );
2230
2231   Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
2232     function(proceed, element, attribute) {
2233       if (attribute === 'title') return element.title;
2234       return proceed(element, attribute);
2235     }
2236   );
2237 }
2238
2239 else if (Prototype.Browser.IE) {
2240   $w('positionedOffset getOffsetParent viewportOffset').each(function(method) {
2241     Element.Methods[method] = Element.Methods[method].wrap(
2242       function(proceed, element) {
2243         element = $(element);
2244         var position = element.getStyle('position');
2245         if (position != 'static') return proceed(element);
2246         element.setStyle({ position: 'relative' });
2247         var value = proceed(element);
2248         element.setStyle({ position: position });
2249         return value;
2250       }
2251     );
2252   });
2253
2254   Element.Methods.getStyle = function(element, style) {
2255     element = $(element);
2256     style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
2257     var value = element.style[style];
2258     if (!value && element.currentStyle) value = element.currentStyle[style];
2259
2260     if (style == 'opacity') {
2261       if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
2262         if (value[1]) return parseFloat(value[1]) / 100;
2263       return 1.0;
2264     }
2265
2266     if (value == 'auto') {
2267       if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
2268         return element['offset' + style.capitalize()] + 'px';
2269       return null;
2270     }
2271     return value;
2272   };
2273
2274   Element.Methods.setOpacity = function(element, value) {
2275     function stripAlpha(filter){
2276       return filter.replace(/alpha\([^\)]*\)/gi,'');
2277     }
2278     element = $(element);
2279     var currentStyle = element.currentStyle;
2280     if ((currentStyle && !currentStyle.hasLayout) ||
2281       (!currentStyle && element.style.zoom == 'normal'))
2282         element.style.zoom = 1;
2283
2284     var filter = element.getStyle('filter'), style = element.style;
2285     if (value == 1 || value === '') {
2286       (filter = stripAlpha(filter)) ?
2287         style.filter = filter : style.removeAttribute('filter');
2288       return element;
2289     } else if (value < 0.00001) value = 0;
2290     style.filter = stripAlpha(filter) +
2291       'alpha(opacity=' + (value * 100) + ')';
2292     return element;
2293   };
2294
2295   Element._attributeTranslations = {
2296     read: {
2297       names: {
2298         'class': 'className',
2299         'for':   'htmlFor'
2300       },
2301       values: {
2302         _getAttr: function(element, attribute) {
2303           return element.getAttribute(attribute, 2);
2304         },
2305         _getAttrNode: function(element, attribute) {
2306           var node = element.getAttributeNode(attribute);
2307           return node ? node.value : "";
2308         },
2309         _getEv: function(element, attribute) {
2310           attribute = element.getAttribute(attribute);
2311           return attribute ? attribute.toString().slice(23, -2) : null;
2312         },
2313         _flag: function(element, attribute) {
2314           return $(element).hasAttribute(attribute) ? attribute : null;
2315         },
2316         style: function(element) {
2317           return element.style.cssText.toLowerCase();
2318         },
2319         title: function(element) {
2320           return element.title;
2321         }
2322       }
2323     }
2324   };
2325
2326   Element._attributeTranslations.write = {
2327     names: Object.clone(Element._attributeTranslations.read.names),
2328     values: {
2329       checked: function(element, value) {
2330         element.checked = !!value;
2331       },
2332
2333       style: function(element, value) {
2334         element.style.cssText = value ? value : '';
2335       }
2336     }
2337   };
2338
2339   Element._attributeTranslations.has = {};
2340
2341   $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
2342       'encType maxLength readOnly longDesc').each(function(attr) {
2343     Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
2344     Element._attributeTranslations.has[attr.toLowerCase()] = attr;
2345   });
2346
2347   (function(v) {
2348     Object.extend(v, {
2349       href:        v._getAttr,
2350       src:         v._getAttr,
2351       type:        v._getAttr,
2352       action:      v._getAttrNode,
2353       disabled:    v._flag,
2354       checked:     v._flag,
2355       readonly:    v._flag,
2356       multiple:    v._flag,
2357       onload:      v._getEv,
2358       onunload:    v._getEv,
2359       onclick:     v._getEv,
2360       ondblclick:  v._getEv,
2361       onmousedown: v._getEv,
2362       onmouseup:   v._getEv,
2363       onmouseover: v._getEv,
2364       onmousemove: v._getEv,
2365       onmouseout:  v._getEv,
2366       onfocus:     v._getEv,
2367       onblur:      v._getEv,
2368       onkeypress:  v._getEv,
2369       onkeydown:   v._getEv,
2370       onkeyup:     v._getEv,
2371       onsubmit:    v._getEv,
2372       onreset:     v._getEv,
2373       onselect:    v._getEv,
2374       onchange:    v._getEv
2375     });
2376   })(Element._attributeTranslations.read.values);
2377 }
2378
2379 else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
2380   Element.Methods.setOpacity = function(element, value) {
2381     element = $(element);
2382     element.style.opacity = (value == 1) ? 0.999999 :
2383       (value === '') ? '' : (value < 0.00001) ? 0 : value;
2384     return element;
2385   };
2386 }
2387
2388 else if (Prototype.Browser.WebKit) {
2389   Element.Methods.setOpacity = function(element, value) {
2390     element = $(element);
2391     element.style.opacity = (value == 1 || value === '') ? '' :
2392       (value < 0.00001) ? 0 : value;
2393
2394     if (value == 1)
2395       if(element.tagName == 'IMG' && element.width) {
2396         element.width++; element.width--;
2397       } else try {
2398         var n = document.createTextNode(' ');
2399         element.appendChild(n);
2400         element.removeChild(n);
2401       } catch (e) { }
2402
2403     return element;
2404   };
2405
2406   // Safari returns margins on body which is incorrect if the child is absolutely
2407   // positioned.  For performance reasons, redefine Element#cumulativeOffset for
2408   // KHTML/WebKit only.
2409   Element.Methods.cumulativeOffset = function(element) {
2410     var valueT = 0, valueL = 0;
2411     do {
2412       valueT += element.offsetTop  || 0;
2413       valueL += element.offsetLeft || 0;
2414       if (element.offsetParent == document.body)
2415         if (Element.getStyle(element, 'position') == 'absolute') break;
2416
2417       element = element.offsetParent;
2418     } while (element);
2419
2420     return Element._returnOffset(valueL, valueT);
2421   };
2422 }
2423
2424 if (Prototype.Browser.IE || Prototype.Browser.Opera) {
2425   // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
2426   Element.Methods.update = function(element, content) {
2427     element = $(element);
2428
2429     if (content && content.toElement) content = content.toElement();
2430     if (Object.isElement(content)) return element.update().insert(content);
2431
2432     content = Object.toHTML(content);
2433     var tagName = element.tagName.toUpperCase();
2434
2435     if (tagName in Element._insertionTranslations.tags) {
2436       $A(element.childNodes).each(function(node) { element.removeChild(node) });
2437       Element._getContentFromAnonymousElement(tagName, content.stripScripts())
2438         .each(function(node) { element.appendChild(node) });
2439     }
2440     else element.innerHTML = content.stripScripts();
2441
2442     content.evalScripts.bind(content).defer();
2443     return element;
2444   };
2445 }
2446
2447 if (document.createElement('div').outerHTML) {
2448   Element.Methods.replace = function(element, content) {
2449     element = $(element);
2450
2451     if (content && content.toElement) content = content.toElement();
2452     if (Object.isElement(content)) {
2453       element.parentNode.replaceChild(content, element);
2454       return element;
2455     }
2456
2457     content = Object.toHTML(content);
2458     var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
2459
2460     if (Element._insertionTranslations.tags[tagName]) {
2461       var nextSibling = element.next();
2462       var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
2463       parent.removeChild(element);
2464       if (nextSibling)
2465         fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
2466       else
2467         fragments.each(function(node) { parent.appendChild(node) });
2468     }
2469     else element.outerHTML = content.stripScripts();
2470
2471     content.evalScripts.bind(content).defer();
2472     return element;
2473   };
2474 }
2475
2476 Element._returnOffset = function(l, t) {
2477   var result = [l, t];
2478   result.left = l;
2479   result.top = t;
2480   return result;
2481 };
2482
2483 Element._getContentFromAnonymousElement = function(tagName, html) {
2484   var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
2485   div.innerHTML = t[0] + html + t[1];
2486   t[2].times(function() { div = div.firstChild });
2487   return $A(div.childNodes);
2488 };
2489
2490 Element._insertionTranslations = {
2491   before: {
2492     adjacency: 'beforeBegin',
2493     insert: function(element, node) {
2494       element.parentNode.insertBefore(node, element);
2495     },
2496     initializeRange: function(element, range) {
2497       range.setStartBefore(element);
2498     }
2499   },
2500   top: {
2501     adjacency: 'afterBegin',
2502     insert: function(element, node) {
2503       element.insertBefore(node, element.firstChild);
2504     },
2505     initializeRange: function(element, range) {
2506       range.selectNodeContents(element);
2507       range.collapse(true);
2508     }
2509   },
2510   bottom: {
2511     adjacency: 'beforeEnd',
2512     insert: function(element, node) {
2513       element.appendChild(node);
2514     }
2515   },
2516   after: {
2517     adjacency: 'afterEnd',
2518     insert: function(element, node) {
2519       element.parentNode.insertBefore(node, element.nextSibling);
2520     },
2521     initializeRange: function(element, range) {
2522       range.setStartAfter(element);
2523     }
2524   },
2525   tags: {
2526     TABLE:  ['<table>',                '</table>',                   1],
2527     TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
2528     TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
2529     TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
2530     SELECT: ['<select>',               '</select>',                  1]
2531   }
2532 };
2533
2534 (function() {
2535   this.bottom.initializeRange = this.top.initializeRange;
2536   Object.extend(this.tags, {
2537     THEAD: this.tags.TBODY,
2538     TFOOT: this.tags.TBODY,
2539     TH:    this.tags.TD
2540   });
2541 }).call(Element._insertionTranslations);
2542
2543 Element.Methods.Simulated = {
2544   hasAttribute: function(element, attribute) {
2545     attribute = Element._attributeTranslations.has[attribute] || attribute;
2546     var node = $(element).getAttributeNode(attribute);
2547     return node && node.specified;
2548   }
2549 };
2550
2551 Element.Methods.ByTag = { };
2552
2553 Object.extend(Element, Element.Methods);
2554
2555 if (!Prototype.BrowserFeatures.ElementExtensions &&
2556     document.createElement('div').__proto__) {
2557   window.HTMLElement = { };
2558   window.HTMLElement.prototype = document.createElement('div').__proto__;
2559   Prototype.BrowserFeatures.ElementExtensions = true;
2560 }
2561
2562 Element.extend = (function() {
2563   if (Prototype.BrowserFeatures.SpecificElementExtensions)
2564     return Prototype.K;
2565
2566   var Methods = { }, ByTag = Element.Methods.ByTag;
2567
2568   var extend = Object.extend(function(element) {
2569     if (!element || element._extendedByPrototype ||
2570         element.nodeType != 1 || element == window) return element;
2571
2572     var methods = Object.clone(Methods),
2573       tagName = element.tagName, property, value;
2574
2575     // extend methods for specific tags
2576     if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
2577
2578     for (property in methods) {
2579       value = methods[property];
2580       if (Object.isFunction(value) && !(property in element))
2581         element[property] = value.methodize();
2582     }
2583
2584     element._extendedByPrototype = Prototype.emptyFunction;
2585     return element;
2586
2587   }, {
2588     refresh: function() {
2589       // extend methods for all tags (Safari doesn't need this)
2590       if (!Prototype.BrowserFeatures.ElementExtensions) {
2591         Object.extend(Methods, Element.Methods);
2592         Object.extend(Methods, Element.Methods.Simulated);
2593       }
2594     }
2595   });
2596
2597   extend.refresh();
2598   return extend;
2599 })();
2600
2601 Element.hasAttribute = function(element, attribute) {
2602   if (element.hasAttribute) return element.hasAttribute(attribute);
2603   return Element.Methods.Simulated.hasAttribute(element, attribute);
2604 };
2605
2606 Element.addMethods = function(methods) {
2607   var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
2608
2609   if (!methods) {
2610     Object.extend(Form, Form.Methods);
2611     Object.extend(Form.Element, Form.Element.Methods);
2612     Object.extend(Element.Methods.ByTag, {
2613       "FORM":     Object.clone(Form.Methods),
2614       "INPUT":    Object.clone(Form.Element.Methods),
2615       "SELECT":   Object.clone(Form.Element.Methods),
2616       "TEXTAREA": Object.clone(Form.Element.Methods)
2617     });
2618   }
2619
2620   if (arguments.length == 2) {
2621     var tagName = methods;
2622     methods = arguments[1];
2623   }
2624
2625   if (!tagName) Object.extend(Element.Methods, methods || { });
2626   else {
2627     if (Object.isArray(tagName)) tagName.each(extend);
2628     else extend(tagName);
2629   }
2630
2631   function extend(tagName) {
2632     tagName = tagName.toUpperCase();
2633     if (!Element.Methods.ByTag[tagName])
2634       Element.Methods.ByTag[tagName] = { };
2635     Object.extend(Element.Methods.ByTag[tagName], methods);
2636   }
2637
2638   function copy(methods, destination, onlyIfAbsent) {
2639     onlyIfAbsent = onlyIfAbsent || false;
2640     for (var property in methods) {
2641       var value = methods[property];
2642       if (!Object.isFunction(value)) continue;
2643       if (!onlyIfAbsent || !(property in destination))
2644         destination[property] = value.methodize();
2645     }
2646   }
2647
2648   function findDOMClass(tagName) {
2649     var klass;
2650     var trans = {
2651       "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
2652       "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
2653       "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
2654       "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
2655       "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
2656       "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
2657       "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
2658       "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
2659       "FrameSet", "IFRAME": "IFrame"
2660     };
2661     if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
2662     if (window[klass]) return window[klass];
2663     klass = 'HTML' + tagName + 'Element';
2664     if (window[klass]) return window[klass];
2665     klass = 'HTML' + tagName.capitalize() + 'Element';
2666     if (window[klass]) return window[klass];
2667
2668     window[klass] = { };
2669     window[klass].prototype = document.createElement(tagName).__proto__;
2670     return window[klass];
2671   }
2672
2673   if (F.ElementExtensions) {
2674     copy(Element.Methods, HTMLElement.prototype);
2675     copy(Element.Methods.Simulated, HTMLElement.prototype, true);
2676   }
2677
2678   if (F.SpecificElementExtensions) {
2679     for (var tag in Element.Methods.ByTag) {
2680       var klass = findDOMClass(tag);
2681       if (Object.isUndefined(klass)) continue;
2682       copy(T[tag], klass.prototype);
2683     }
2684   }
2685
2686   Object.extend(Element, Element.Methods);
2687   delete Element.ByTag;
2688
2689   if (Element.extend.refresh) Element.extend.refresh();
2690   Element.cache = { };
2691 };
2692
2693 document.viewport = {
2694   getDimensions: function() {
2695     var dimensions = { };
2696     var B = Prototype.Browser;
2697     $w('width height').each(function(d) {
2698       var D = d.capitalize();
2699       dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
2700         (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
2701     });
2702     return dimensions;
2703   },
2704
2705   getWidth: function() {
2706     return this.getDimensions().width;
2707   },
2708
2709   getHeight: function() {
2710     return this.getDimensions().height;
2711   },
2712
2713   getScrollOffsets: function() {
2714     return Element._returnOffset(
2715       window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
2716       window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
2717   }
2718 };
2719 /* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
2720  * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
2721  * license.  Please see http://www.yui-ext.com/ for more information. */
2722
2723 var Selector = Class.create({
2724   initialize: function(expression) {
2725     this.expression = expression.strip();
2726     this.compileMatcher();
2727   },
2728
2729   shouldUseXPath: function() {
2730     if (!Prototype.BrowserFeatures.XPath) return false;
2731
2732     var e = this.expression;
2733
2734     // Safari 3 chokes on :*-of-type and :empty
2735     if (Prototype.Browser.WebKit &&
2736      (e.include("-of-type") || e.include(":empty")))
2737       return false;
2738
2739     // XPath can't do namespaced attributes, nor can it read
2740     // the "checked" property from DOM nodes
2741     if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
2742       return false;
2743
2744     return true;
2745   },
2746
2747   compileMatcher: function() {
2748     if (this.shouldUseXPath())
2749       return this.compileXPathMatcher();
2750
2751     var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
2752         c = Selector.criteria, le, p, m;
2753
2754     if (Selector._cache[e]) {
2755       this.matcher = Selector._cache[e];
2756       return;
2757     }
2758
2759     this.matcher = ["this.matcher = function(root) {",
2760                     "var r = root, h = Selector.handlers, c = false, n;"];
2761
2762     while (e && le != e && (/\S/).test(e)) {
2763       le = e;
2764       for (var i in ps) {
2765         p = ps[i];
2766         if (m = e.match(p)) {
2767           this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
2768               new Template(c[i]).evaluate(m));
2769           e = e.replace(m[0], '');
2770           break;
2771         }
2772       }
2773     }
2774
2775     this.matcher.push("return h.unique(n);\n}");
2776     eval(this.matcher.join('\n'));
2777     Selector._cache[this.expression] = this.matcher;
2778   },
2779
2780   compileXPathMatcher: function() {
2781     var e = this.expression, ps = Selector.patterns,
2782         x = Selector.xpath, le, m;
2783
2784     if (Selector._cache[e]) {
2785       this.xpath = Selector._cache[e]; return;
2786     }
2787
2788     this.matcher = ['.//*'];
2789     while (e && le != e && (/\S/).test(e)) {
2790       le = e;
2791       for (var i in ps) {
2792         if (m = e.match(ps[i])) {
2793           this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
2794             new Template(x[i]).evaluate(m));
2795           e = e.replace(m[0], '');
2796           break;
2797         }
2798       }
2799     }
2800
2801     this.xpath = this.matcher.join('');
2802     Selector._cache[this.expression] = this.xpath;
2803   },
2804
2805   findElements: function(root) {
2806     root = root || document;
2807     if (this.xpath) return document._getElementsByXPath(this.xpath, root);
2808     return this.matcher(root);
2809   },
2810
2811   match: function(element) {
2812     this.tokens = [];
2813
2814     var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
2815     var le, p, m;
2816
2817     while (e && le !== e && (/\S/).test(e)) {
2818       le = e;
2819       for (var i in ps) {
2820         p = ps[i];
2821         if (m = e.match(p)) {
2822           // use the Selector.assertions methods unless the selector
2823           // is too complex.
2824           if (as[i]) {
2825             this.tokens.push([i, Object.clone(m)]);
2826             e = e.replace(m[0], '');
2827           } else {
2828             // reluctantly do a document-wide search
2829             // and look for a match in the array
2830             return this.findElements(document).include(element);
2831           }
2832         }
2833       }
2834     }
2835
2836     var match = true, name, matches;
2837     for (var i = 0, token; token = this.tokens[i]; i++) {
2838       name = token[0], matches = token[1];
2839       if (!Selector.assertions[name](element, matches)) {
2840         match = false; break;
2841       }
2842     }
2843
2844     return match;
2845   },
2846
2847   toString: function() {
2848     return this.expression;
2849   },
2850
2851   inspect: function() {
2852     return "#<Selector:" + this.expression.inspect() + ">";
2853   }
2854 });
2855
2856 Object.extend(Selector, {
2857   _cache: { },
2858
2859   xpath: {
2860     descendant:   "//*",
2861     child:        "/*",
2862     adjacent:     "/following-sibling::*[1]",
2863     laterSibling: '/following-sibling::*',
2864     tagName:      function(m) {
2865       if (m[1] == '*') return '';
2866       return "[local-name()='" + m[1].toLowerCase() +
2867              "' or local-name()='" + m[1].toUpperCase() + "']";
2868     },
2869     className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
2870     id:           "[@id='#{1}']",
2871     attrPresence: function(m) {
2872       m[1] = m[1].toLowerCase();
2873       return new Template("[@#{1}]").evaluate(m);
2874     },
2875     attr: function(m) {
2876       m[1] = m[1].toLowerCase();
2877       m[3] = m[5] || m[6];
2878       return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
2879     },
2880     pseudo: function(m) {
2881       var h = Selector.xpath.pseudos[m[1]];
2882       if (!h) return '';
2883       if (Object.isFunction(h)) return h(m);
2884       return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
2885     },
2886     operators: {
2887       '=':  "[@#{1}='#{3}']",
2888       '!=': "[@#{1}!='#{3}']",
2889       '^=': "[starts-with(@#{1}, '#{3}')]",
2890       '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
2891       '*=': "[contains(@#{1}, '#{3}')]",
2892       '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
2893       '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
2894     },
2895     pseudos: {
2896       'first-child': '[not(preceding-sibling::*)]',
2897       'last-child':  '[not(following-sibling::*)]',
2898       'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
2899       'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
2900       'checked':     "[@checked]",
2901       'disabled':    "[@disabled]",
2902       'enabled':     "[not(@disabled)]",
2903       'not': function(m) {
2904         var e = m[6], p = Selector.patterns,
2905             x = Selector.xpath, le, v;
2906
2907         var exclusion = [];
2908         while (e && le != e && (/\S/).test(e)) {
2909           le = e;
2910           for (var i in p) {
2911             if (m = e.match(p[i])) {
2912               v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
2913               exclusion.push("(" + v.substring(1, v.length - 1) + ")");
2914               e = e.replace(m[0], '');
2915               break;
2916             }
2917           }
2918         }
2919         return "[not(" + exclusion.join(" and ") + ")]";
2920       },
2921       'nth-child':      function(m) {
2922         return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
2923       },
2924       'nth-last-child': function(m) {
2925         return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
2926       },
2927       'nth-of-type':    function(m) {
2928         return Selector.xpath.pseudos.nth("position() ", m);
2929       },
2930       'nth-last-of-type': function(m) {
2931         return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
2932       },
2933       'first-of-type':  function(m) {
2934         m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
2935       },
2936       'last-of-type':   function(m) {
2937         m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
2938       },
2939       'only-of-type':   function(m) {
2940         var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
2941       },
2942       nth: function(fragment, m) {
2943         var mm, formula = m[6], predicate;
2944         if (formula == 'even') formula = '2n+0';
2945         if (formula == 'odd')  formula = '2n+1';
2946         if (mm = formula.match(/^(\d+)$/)) // digit only
2947           return '[' + fragment + "= " + mm[1] + ']';
2948         if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
2949           if (mm[1] == "-") mm[1] = -1;
2950           var a = mm[1] ? Number(mm[1]) : 1;
2951           var b = mm[2] ? Number(mm[2]) : 0;
2952           predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
2953           "((#{fragment} - #{b}) div #{a} >= 0)]";
2954           return new Template(predicate).evaluate({
2955             fragment: fragment, a: a, b: b });
2956         }
2957       }
2958     }
2959   },
2960
2961   criteria: {
2962     tagName:      'n = h.tagName(n, r, "#{1}", c);   c = false;',
2963     className:    'n = h.className(n, r, "#{1}", c); c = false;',
2964     id:           'n = h.id(n, r, "#{1}", c);        c = false;',
2965     attrPresence: 'n = h.attrPresence(n, r, "#{1}"); c = false;',
2966     attr: function(m) {
2967       m[3] = (m[5] || m[6]);
2968       return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}"); c = false;').evaluate(m);
2969     },
2970     pseudo: function(m) {
2971       if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
2972       return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
2973     },
2974     descendant:   'c = "descendant";',
2975     child:        'c = "child";',
2976     adjacent:     'c = "adjacent";',
2977     laterSibling: 'c = "laterSibling";'
2978   },
2979
2980   patterns: {
2981     // combinators must be listed first
2982     // (and descendant needs to be last combinator)
2983     laterSibling: /^\s*~\s*/,
2984     child:        /^\s*>\s*/,
2985     adjacent:     /^\s*\+\s*/,
2986     descendant:   /^\s/,
2987
2988     // selectors follow
2989     tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
2990     id:           /^#([\w\-\*]+)(\b|$)/,
2991     className:    /^\.([\w\-\*]+)(\b|$)/,
2992     pseudo:       /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s)|(?=:))/,
2993     attrPresence: /^\[([\w]+)\]/,
2994     attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
2995   },
2996
2997   // for Selector.match and Element#match
2998   assertions: {
2999     tagName: function(element, matches) {
3000       return matches[1].toUpperCase() == element.tagName.toUpperCase();
3001     },
3002
3003     className: function(element, matches) {
3004       return Element.hasClassName(element, matches[1]);
3005     },
3006
3007     id: function(element, matches) {
3008       return element.id === matches[1];
3009     },
3010
3011     attrPresence: function(element, matches) {
3012       return Element.hasAttribute(element, matches[1]);
3013     },
3014
3015     attr: function(element, matches) {
3016       var nodeValue = Element.readAttribute(element, matches[1]);
3017       return Selector.operators[matches[2]](nodeValue, matches[3]);
3018     }
3019   },
3020
3021   handlers: {
3022     // UTILITY FUNCTIONS
3023     // joins two collections
3024     concat: function(a, b) {
3025       for (var i = 0, node; node = b[i]; i++)
3026         a.push(node);
3027       return a;
3028     },
3029
3030     // marks an array of nodes for counting
3031     mark: function(nodes) {
3032       for (var i = 0, node; node = nodes[i]; i++)
3033         node._counted = true;
3034       return nodes;
3035     },
3036
3037     unmark: function(nodes) {
3038       for (var i = 0, node; node = nodes[i]; i++)
3039         node._counted = undefined;
3040       return nodes;
3041     },
3042
3043     // mark each child node with its position (for nth calls)
3044     // "ofType" flag indicates whether we're indexing for nth-of-type
3045     // rather than nth-child
3046     index: function(parentNode, reverse, ofType) {
3047       parentNode._counted = true;
3048       if (reverse) {
3049         for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
3050           var node = nodes[i];
3051           if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
3052         }
3053       } else {
3054         for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
3055           if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
3056       }
3057     },
3058
3059     // filters out duplicates and extends all nodes
3060     unique: function(nodes) {
3061       if (nodes.length == 0) return nodes;
3062       var results = [], n;
3063       for (var i = 0, l = nodes.length; i < l; i++)
3064         if (!(n = nodes[i])._counted) {
3065           n._counted = true;
3066           results.push(Element.extend(n));
3067         }
3068       return Selector.handlers.unmark(results);
3069     },
3070
3071     // COMBINATOR FUNCTIONS
3072     descendant: function(nodes) {
3073       var h = Selector.handlers;
3074       for (var i = 0, results = [], node; node = nodes[i]; i++)
3075         h.concat(results, node.getElementsByTagName('*'));
3076       return results;
3077     },
3078
3079     child: function(nodes) {
3080       var h = Selector.handlers;
3081       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3082         for (var j = 0, child; child = node.childNodes[j]; j++)
3083           if (child.nodeType == 1 && child.tagName != '!') results.push(child);
3084       }
3085       return results;
3086     },
3087
3088     adjacent: function(nodes) {
3089       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3090         var next = this.nextElementSibling(node);
3091         if (next) results.push(next);
3092       }
3093       return results;
3094     },
3095
3096     laterSibling: function(nodes) {
3097       var h = Selector.handlers;
3098       for (var i = 0, results = [], node; node = nodes[i]; i++)
3099         h.concat(results, Element.nextSiblings(node));
3100       return results;
3101     },
3102
3103     nextElementSibling: function(node) {
3104       while (node = node.nextSibling)
3105               if (node.nodeType == 1) return node;
3106       return null;
3107     },
3108
3109     previousElementSibling: function(node) {
3110       while (node = node.previousSibling)
3111         if (node.nodeType == 1) return node;
3112       return null;
3113     },
3114
3115     // TOKEN FUNCTIONS
3116     tagName: function(nodes, root, tagName, combinator) {
3117       tagName = tagName.toUpperCase();
3118       var results = [], h = Selector.handlers;
3119       if (nodes) {
3120         if (combinator) {
3121           // fastlane for ordinary descendant combinators
3122           if (combinator == "descendant") {
3123             for (var i = 0, node; node = nodes[i]; i++)
3124               h.concat(results, node.getElementsByTagName(tagName));
3125             return results;
3126           } else nodes = this[combinator](nodes);
3127           if (tagName == "*") return nodes;
3128         }
3129         for (var i = 0, node; node = nodes[i]; i++)
3130           if (node.tagName.toUpperCase() == tagName) results.push(node);
3131         return results;
3132       } else return root.getElementsByTagName(tagName);
3133     },
3134
3135     id: function(nodes, root, id, combinator) {
3136       var targetNode = $(id), h = Selector.handlers;
3137       if (!targetNode) return [];
3138       if (!nodes && root == document) return [targetNode];
3139       if (nodes) {
3140         if (combinator) {
3141           if (combinator == 'child') {
3142             for (var i = 0, node; node = nodes[i]; i++)
3143               if (targetNode.parentNode == node) return [targetNode];
3144           } else if (combinator == 'descendant') {
3145             for (var i = 0, node; node = nodes[i]; i++)
3146               if (Element.descendantOf(targetNode, node)) return [targetNode];
3147           } else if (combinator == 'adjacent') {
3148             for (var i = 0, node; node = nodes[i]; i++)
3149               if (Selector.handlers.previousElementSibling(targetNode) == node)
3150                 return [targetNode];
3151           } else nodes = h[combinator](nodes);
3152         }
3153         for (var i = 0, node; node = nodes[i]; i++)
3154           if (node == targetNode) return [targetNode];
3155         return [];
3156       }
3157       return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
3158     },
3159
3160     className: function(nodes, root, className, combinator) {
3161       if (nodes && combinator) nodes = this[combinator](nodes);
3162       return Selector.handlers.byClassName(nodes, root, className);
3163     },
3164
3165     byClassName: function(nodes, root, className) {
3166       if (!nodes) nodes = Selector.handlers.descendant([root]);
3167       var needle = ' ' + className + ' ';
3168       for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
3169         nodeClassName = node.className;
3170         if (nodeClassName.length == 0) continue;
3171         if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
3172           results.push(node);
3173       }
3174       return results;
3175     },
3176
3177     attrPresence: function(nodes, root, attr) {
3178       if (!nodes) nodes = root.getElementsByTagName("*");
3179       var results = [];
3180       for (var i = 0, node; node = nodes[i]; i++)
3181         if (Element.hasAttribute(node, attr)) results.push(node);
3182       return results;
3183     },
3184
3185     attr: function(nodes, root, attr, value, operator) {
3186       if (!nodes) nodes = root.getElementsByTagName("*");
3187       var handler = Selector.operators[operator], results = [];
3188       for (var i = 0, node; node = nodes[i]; i++) {
3189         var nodeValue = Element.readAttribute(node, attr);
3190         if (nodeValue === null) continue;
3191         if (handler(nodeValue, value)) results.push(node);
3192       }
3193       return results;
3194     },
3195
3196     pseudo: function(nodes, name, value, root, combinator) {
3197       if (nodes && combinator) nodes = this[combinator](nodes);
3198       if (!nodes) nodes = root.getElementsByTagName("*");
3199       return Selector.pseudos[name](nodes, value, root);
3200     }
3201   },
3202
3203   pseudos: {
3204     'first-child': function(nodes, value, root) {
3205       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3206         if (Selector.handlers.previousElementSibling(node)) continue;
3207           results.push(node);
3208       }
3209       return results;
3210     },
3211     'last-child': function(nodes, value, root) {
3212       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3213         if (Selector.handlers.nextElementSibling(node)) continue;
3214           results.push(node);
3215       }
3216       return results;
3217     },
3218     'only-child': function(nodes, value, root) {
3219       var h = Selector.handlers;
3220       for (var i = 0, results = [], node; node = nodes[i]; i++)
3221         if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
3222           results.push(node);
3223       return results;
3224     },
3225     'nth-child':        function(nodes, formula, root) {
3226       return Selector.pseudos.nth(nodes, formula, root);
3227     },
3228     'nth-last-child':   function(nodes, formula, root) {
3229       return Selector.pseudos.nth(nodes, formula, root, true);
3230     },
3231     'nth-of-type':      function(nodes, formula, root) {
3232       return Selector.pseudos.nth(nodes, formula, root, false, true);
3233     },
3234     'nth-last-of-type': function(nodes, formula, root) {
3235       return Selector.pseudos.nth(nodes, formula, root, true, true);
3236     },
3237     'first-of-type':    function(nodes, formula, root) {
3238       return Selector.pseudos.nth(nodes, "1", root, false, true);
3239     },
3240     'last-of-type':     function(nodes, formula, root) {
3241       return Selector.pseudos.nth(nodes, "1", root, true, true);
3242     },
3243     'only-of-type':     function(nodes, formula, root) {
3244       var p = Selector.pseudos;
3245       return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
3246     },
3247
3248     // handles the an+b logic
3249     getIndices: function(a, b, total) {
3250       if (a == 0) return b > 0 ? [b] : [];
3251       return $R(1, total).inject([], function(memo, i) {
3252         if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
3253         return memo;
3254       });
3255     },
3256
3257     // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
3258     nth: function(nodes, formula, root, reverse, ofType) {
3259       if (nodes.length == 0) return [];
3260       if (formula == 'even') formula = '2n+0';
3261       if (formula == 'odd')  formula = '2n+1';
3262       var h = Selector.handlers, results = [], indexed = [], m;
3263       h.mark(nodes);
3264       for (var i = 0, node; node = nodes[i]; i++) {
3265         if (!node.parentNode._counted) {
3266           h.index(node.parentNode, reverse, ofType);
3267           indexed.push(node.parentNode);
3268         }
3269       }
3270       if (formula.match(/^\d+$/)) { // just a number
3271         formula = Number(formula);
3272         for (var i = 0, node; node = nodes[i]; i++)
3273           if (node.nodeIndex == formula) results.push(node);
3274       } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
3275         if (m[1] == "-") m[1] = -1;
3276         var a = m[1] ? Number(m[1]) : 1;
3277         var b = m[2] ? Number(m[2]) : 0;
3278         var indices = Selector.pseudos.getIndices(a, b, nodes.length);
3279         for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
3280           for (var j = 0; j < l; j++)
3281             if (node.nodeIndex == indices[j]) results.push(node);
3282         }
3283       }
3284       h.unmark(nodes);
3285       h.unmark(indexed);
3286       return results;
3287     },
3288
3289     'empty': function(nodes, value, root) {
3290       for (var i = 0, results = [], node; node = nodes[i]; i++) {
3291         // IE treats comments as element nodes
3292         if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
3293         results.push(node);
3294       }
3295       return results;
3296     },
3297
3298     'not': function(nodes, selector, root) {
3299       var h = Selector.handlers, selectorType, m;
3300       var exclusions = new Selector(selector).findElements(root);
3301       h.mark(exclusions);
3302       for (var i = 0, results = [], node; node = nodes[i]; i++)
3303         if (!node._counted) results.push(node);
3304       h.unmark(exclusions);
3305       return results;
3306     },
3307
3308     'enabled': function(nodes, value, root) {
3309       for (var i = 0, results = [], node; node = nodes[i]; i++)
3310         if (!node.disabled) results.push(node);
3311       return results;
3312     },
3313
3314     'disabled': function(nodes, value, root) {
3315       for (var i = 0, results = [], node; node = nodes[i]; i++)
3316         if (node.disabled) results.push(node);
3317       return results;
3318     },
3319
3320     'checked': function(nodes, value, root) {
3321       for (var i = 0, results = [], node; node = nodes[i]; i++)
3322         if (node.checked) results.push(node);
3323       return results;
3324     }
3325   },
3326
3327   operators: {
3328     '=':  function(nv, v) { return nv == v; },
3329     '!=': function(nv, v) { return nv != v; },
3330     '^=': function(nv, v) { return nv.startsWith(v); },
3331     '$=': function(nv, v) { return nv.endsWith(v); },
3332     '*=': function(nv, v) { return nv.include(v); },
3333     '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
3334     '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
3335   },
3336
3337   matchElements: function(elements, expression) {
3338     var matches = new Selector(expression).findElements(), h = Selector.handlers;
3339     h.mark(matches);
3340     for (var i = 0, results = [], element; element = elements[i]; i++)
3341       if (element._counted) results.push(element);
3342     h.unmark(matches);
3343     return results;
3344   },
3345
3346   findElement: function(elements, expression, index) {
3347     if (Object.isNumber(expression)) {
3348       index = expression; expression = false;
3349     }
3350     return Selector.matchElements(elements, expression || '*')[index || 0];
3351   },
3352
3353   findChildElements: function(element, expressions) {
3354     var exprs = expressions.join(',');
3355     expressions = [];
3356     exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
3357       expressions.push(m[1].strip());
3358     });
3359     var results = [], h = Selector.handlers;
3360     for (var i = 0, l = expressions.length, selector; i < l; i++) {
3361       selector = new Selector(expressions[i].strip());
3362       h.concat(results, selector.findElements(element));
3363     }
3364     return (l > 1) ? h.unique(results) : results;
3365   }
3366 });
3367
3368 if (Prototype.Browser.IE) {
3369   // IE returns comment nodes on getElementsByTagName("*").
3370   // Filter them out.
3371   Selector.handlers.concat = function(a, b) {
3372     for (var i = 0, node; node = b[i]; i++)
3373       if (node.tagName !== "!") a.push(node);
3374     return a;
3375   };
3376 }
3377
3378 function $$() {
3379   return Selector.findChildElements(document, $A(arguments));
3380 }
3381 var Form = {
3382   reset: function(form) {
3383     $(form).reset();
3384     return form;
3385   },
3386
3387   serializeElements: function(elements, options) {
3388     if (typeof options != 'object') options = { hash: !!options };
3389     else if (Object.isUndefined(options.hash)) options.hash = true;
3390     var key, value, submitted = false, submit = options.submit;
3391
3392     var data = elements.inject({ }, function(result, element) {
3393       if (!element.disabled && element.name) {
3394         key = element.name; value = $(element).getValue();
3395         if (value != null && (element.type != 'submit' || (!submitted &&
3396             submit !== false && (!submit || key == submit) && (submitted = true)))) {
3397           if (key in result) {
3398             // a key is already present; construct an array of values
3399             if (!Object.isArray(result[key])) result[key] = [result[key]];
3400             result[key].push(value);
3401           }
3402           else result[key] = value;
3403         }
3404       }
3405       return result;
3406     });
3407
3408     return options.hash ? data : Object.toQueryString(data);
3409   }
3410 };
3411
3412 Form.Methods = {
3413   serialize: function(form, options) {
3414     return Form.serializeElements(Form.getElements(form), options);
3415   },
3416
3417   getElements: function(form) {
3418     return $A($(form).getElementsByTagName('*')).inject([],
3419       function(elements, child) {
3420         if (Form.Element.Serializers[child.tagName.toLowerCase()])
3421           elements.push(Element.extend(child));
3422         return elements;
3423       }
3424     );
3425   },
3426
3427   getInputs: function(form, typeName, name) {
3428     form = $(form);
3429     var inputs = form.getElementsByTagName('input');
3430
3431     if (!typeName && !name) return $A(inputs).map(Element.extend);
3432
3433     for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
3434       var input = inputs[i];
3435       if ((typeName && input.type != typeName) || (name && input.name != name))
3436         continue;
3437       matchingInputs.push(Element.extend(input));
3438     }
3439
3440     return matchingInputs;
3441   },
3442
3443   disable: function(form) {
3444     form = $(form);
3445     Form.getElements(form).invoke('disable');
3446     return form;
3447   },
3448
3449   enable: function(form) {
3450     form = $(form);
3451     Form.getElements(form).invoke('enable');
3452     return form;
3453   },
3454
3455   findFirstElement: function(form) {
3456     var elements = $(form).getElements().findAll(function(element) {
3457       return 'hidden' != element.type && !element.disabled;
3458     });
3459     var firstByIndex = elements.findAll(function(element) {
3460       return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
3461     }).sortBy(function(element) { return element.tabIndex }).first();
3462
3463     return firstByIndex ? firstByIndex : elements.find(function(element) {
3464       return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
3465     });
3466   },
3467
3468   focusFirstElement: function(form) {
3469     form = $(form);
3470     form.findFirstElement().activate();
3471     return form;
3472   },
3473
3474   request: function(form, options) {
3475     form = $(form), options = Object.clone(options || { });
3476
3477     var params = options.parameters, action = form.readAttribute('action') || '';
3478     if (action.blank()) action = window.location.href;
3479     options.parameters = form.serialize(true);
3480
3481     if (params) {
3482       if (Object.isString(params)) params = params.toQueryParams();
3483       Object.extend(options.parameters, params);
3484     }
3485
3486     if (form.hasAttribute('method') && !options.method)
3487       options.method = form.method;
3488
3489     return new Ajax.Request(action, options);
3490   }
3491 };
3492
3493 /*--------------------------------------------------------------------------*/
3494
3495 Form.Element = {
3496   focus: function(element) {
3497     $(element).focus();
3498     return element;
3499   },
3500
3501   select: function(element) {
3502     $(element).select();
3503     return element;
3504   }
3505 };
3506
3507 Form.Element.Methods = {
3508   serialize: function(element) {
3509     element = $(element);
3510     if (!element.disabled && element.name) {
3511       var value = element.getValue();
3512       if (value != undefined) {
3513         var pair = { };
3514         pair[element.name] = value;
3515         return Object.toQueryString(pair);
3516       }
3517     }
3518     return '';
3519   },
3520
3521   getValue: function(element) {
3522     element = $(element);
3523     var method = element.tagName.toLowerCase();
3524     return Form.Element.Serializers[method](element);
3525   },
3526
3527   setValue: function(element, value) {
3528     element = $(element);
3529     var method = element.tagName.toLowerCase();
3530     Form.Element.Serializers[method](element, value);
3531     return element;
3532   },
3533
3534   clear: function(element) {
3535     $(element).value = '';
3536     return element;
3537   },
3538
3539   present: function(element) {
3540     return $(element).value != '';
3541   },
3542
3543   activate: function(element) {
3544     element = $(element);
3545     try {
3546       element.focus();
3547       if (element.select && (element.tagName.toLowerCase() != 'input' ||
3548           !['button', 'reset', 'submit'].include(element.type)))
3549         element.select();
3550     } catch (e) { }
3551     return element;
3552   },
3553
3554   disable: function(element) {
3555     element = $(element);
3556     element.blur();
3557     element.disabled = true;
3558     return element;
3559   },
3560
3561   enable: function(element) {
3562     element = $(element);
3563     element.disabled = false;
3564     return element;
3565   }
3566 };
3567
3568 /*--------------------------------------------------------------------------*/
3569
3570 var Field = Form.Element;
3571 var $F = Form.Element.Methods.getValue;
3572
3573 /*--------------------------------------------------------------------------*/
3574
3575 Form.Element.Serializers = {
3576   input: function(element, value) {
3577     switch (element.type.toLowerCase()) {
3578       case 'checkbox':
3579       case 'radio':
3580         return Form.Element.Serializers.inputSelector(element, value);
3581       default:
3582         return Form.Element.Serializers.textarea(element, value);
3583     }
3584   },
3585
3586   inputSelector: function(element, value) {
3587     if (Object.isUndefined(value)) return element.checked ? element.value : null;
3588     else element.checked = !!value;
3589   },
3590
3591   textarea: function(element, value) {
3592     if (Object.isUndefined(value)) return element.value;
3593     else element.value = value;
3594   },
3595
3596   select: function(element, index) {
3597     if (Object.isUndefined(index))
3598       return this[element.type == 'select-one' ?
3599         'selectOne' : 'selectMany'](element);
3600     else {
3601       var opt, value, single = !Object.isArray(index);
3602       for (var i = 0, length = element.length; i < length; i++) {
3603         opt = element.options[i];
3604         value = this.optionValue(opt);
3605         if (single) {
3606           if (value == index) {
3607             opt.selected = true;
3608             return;
3609           }
3610         }
3611         else opt.selected = index.include(value);
3612       }
3613     }
3614   },
3615
3616   selectOne: function(element) {
3617     var index = element.selectedIndex;
3618     return index >= 0 ? this.optionValue(element.options[index]) : null;
3619   },
3620
3621   selectMany: function(element) {
3622     var values, length = element.length;
3623     if (!length) return null;
3624
3625     for (var i = 0, values = []; i < length; i++) {
3626       var opt = element.options[i];
3627       if (opt.selected) values.push(this.optionValue(opt));
3628     }
3629     return values;
3630   },
3631
3632   optionValue: function(opt) {
3633     // extend element because hasAttribute may not be native
3634     return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
3635   }
3636 };
3637
3638 /*--------------------------------------------------------------------------*/
3639
3640 Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
3641   initialize: function($super, element, frequency, callback) {
3642     $super(callback, frequency);
3643     this.element   = $(element);
3644     this.lastValue = this.getValue();
3645   },
3646
3647   execute: function() {
3648     var value = this.getValue();
3649     if (Object.isString(this.lastValue) && Object.isString(value) ?
3650         this.lastValue != value : String(this.lastValue) != String(value)) {
3651       this.callback(this.element, value);
3652       this.lastValue = value;
3653     }
3654   }
3655 });
3656
3657 Form.Element.Observer = Class.create(Abstract.TimedObserver, {
3658   getValue: function() {
3659     return Form.Element.getValue(this.element);
3660   }
3661 });
3662
3663 Form.Observer = Class.create(Abstract.TimedObserver, {
3664   getValue: function() {
3665     return Form.serialize(this.element);
3666   }
3667 });
3668
3669 /*--------------------------------------------------------------------------*/
3670
3671 Abstract.EventObserver = Class.create({
3672   initialize: function(element, callback) {
3673     this.element  = $(element);
3674     this.callback = callback;
3675
3676     this.lastValue = this.getValue();
3677     if (this.element.tagName.toLowerCase() == 'form')
3678       this.registerFormCallbacks();
3679     else
3680       this.registerCallback(this.element);
3681   },
3682
3683   onElementEvent: function() {
3684     var value = this.getValue();
3685     if (this.lastValue != value) {
3686       this.callback(this.element, value);
3687       this.lastValue = value;
3688     }
3689   },
3690
3691   registerFormCallbacks: function() {
3692     Form.getElements(this.element).each(this.registerCallback, this);
3693   },
3694
3695   registerCallback: function(element) {
3696     if (element.type) {
3697       switch (element.type.toLowerCase()) {
3698         case 'checkbox':
3699         case 'radio':
3700           Event.observe(element, 'click', this.onElementEvent.bind(this));
3701           break;
3702         default:
3703           Event.observe(element, 'change', this.onElementEvent.bind(this));
3704           break;
3705       }
3706     }
3707   }
3708 });
3709
3710 Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
3711   getValue: function() {
3712     return Form.Element.getValue(this.element);
3713   }
3714 });
3715
3716 Form.EventObserver = Class.create(Abstract.EventObserver, {
3717   getValue: function() {
3718     return Form.serialize(this.element);
3719   }
3720 });
3721 if (!window.Event) var Event = { };
3722
3723 Object.extend(Event, {
3724   KEY_BACKSPACE: 8,
3725   KEY_TAB:       9,
3726   KEY_RETURN:   13,
3727   KEY_ESC:      27,
3728   KEY_LEFT:     37,
3729   KEY_UP:       38,
3730   KEY_RIGHT:    39,
3731   KEY_DOWN:     40,
3732   KEY_DELETE:   46,
3733   KEY_HOME:     36,
3734   KEY_END:      35,
3735   KEY_PAGEUP:   33,
3736   KEY_PAGEDOWN: 34,
3737   KEY_INSERT:   45,
3738
3739   cache: { },
3740
3741   relatedTarget: function(event) {
3742     var element;
3743     switch(event.type) {
3744       case 'mouseover': element = event.fromElement; break;
3745       case 'mouseout':  element = event.toElement;   break;
3746       default: return null;
3747     }
3748     return Element.extend(element);
3749   }
3750 });
3751
3752 Event.Methods = (function() {
3753   var isButton;
3754
3755   if (Prototype.Browser.IE) {
3756     var buttonMap = { 0: 1, 1: 4, 2: 2 };
3757     isButton = function(event, code) {
3758       return event.button == buttonMap[code];
3759     };
3760
3761   } else if (Prototype.Browser.WebKit) {
3762     isButton = function(event, code) {
3763       switch (code) {
3764         case 0: return event.which == 1 && !event.metaKey;
3765         case 1: return event.which == 1 && event.metaKey;
3766         default: return false;
3767       }
3768     };
3769
3770   } else {
3771     isButton = function(event, code) {
3772       return event.which ? (event.which === code + 1) : (event.button === code);
3773     };
3774   }
3775
3776   return {
3777     isLeftClick:   function(event) { return isButton(event, 0) },
3778     isMiddleClick: function(event) { return isButton(event, 1) },
3779     isRightClick:  function(event) { return isButton(event, 2) },
3780
3781     element: function(event) {
3782       var node = Event.extend(event).target;
3783       return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
3784     },
3785
3786     findElement: function(event, expression) {
3787       var element = Event.element(event);
3788       if (!expression) return element;
3789       var elements = [element].concat(element.ancestors());
3790       return Selector.findElement(elements, expression, 0);
3791     },
3792
3793     pointer: function(event) {
3794       return {
3795         x: event.pageX || (event.clientX +
3796           (document.documentElement.scrollLeft || document.body.scrollLeft)),
3797         y: event.pageY || (event.clientY +
3798           (document.documentElement.scrollTop || document.body.scrollTop))
3799       };
3800     },
3801
3802     pointerX: function(event) { return Event.pointer(event).x },
3803     pointerY: function(event) { return Event.pointer(event).y },
3804
3805     stop: function(event) {
3806       Event.extend(event);
3807       event.preventDefault();
3808       event.stopPropagation();
3809       event.stopped = true;
3810     }
3811   };
3812 })();
3813
3814 Event.extend = (function() {
3815   var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
3816     m[name] = Event.Methods[name].methodize();
3817     return m;
3818   });
3819
3820   if (Prototype.Browser.IE) {
3821     Object.extend(methods, {
3822       stopPropagation: function() { this.cancelBubble = true },
3823       preventDefault:  function() { this.returnValue = false },
3824       inspect: function() { return "[object Event]" }
3825     });
3826
3827     return function(event) {
3828       if (!event) return false;
3829       if (event._extendedByPrototype) return event;
3830
3831       event._extendedByPrototype = Prototype.emptyFunction;
3832       var pointer = Event.pointer(event);
3833       Object.extend(event, {
3834         target: event.srcElement,
3835         relatedTarget: Event.relatedTarget(event),
3836         pageX:  pointer.x,
3837         pageY:  pointer.y
3838       });
3839       return Object.extend(event, methods);
3840     };
3841
3842   } else {
3843     Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
3844     Object.extend(Event.prototype, methods);
3845     return Prototype.K;
3846   }
3847 })();
3848
3849 Object.extend(Event, (function() {
3850   var cache = Event.cache;
3851
3852   function getEventID(element) {
3853     if (element._eventID) return element._eventID;
3854     arguments.callee.id = arguments.callee.id || 1;
3855     return element._eventID = ++arguments.callee.id;
3856   }
3857
3858   function getDOMEventName(eventName) {
3859     if (eventName && eventName.include(':')) return "dataavailable";
3860     return eventName;
3861   }
3862
3863   function getCacheForID(id) {
3864     return cache[id] = cache[id] || { };
3865   }
3866
3867   function getWrappersForEventName(id, eventName) {
3868     var c = getCacheForID(id);
3869     return c[eventName] = c[eventName] || [];
3870   }
3871
3872   function createWrapper(element, eventName, handler) {
3873     var id = getEventID(element);
3874     var c = getWrappersForEventName(id, eventName);
3875     if (c.pluck("handler").include(handler)) return false;
3876
3877     var wrapper = function(event) {
3878       if (!Event || !Event.extend ||
3879         (event.eventName && event.eventName != eventName))
3880           return false;
3881
3882       Event.extend(event);
3883       handler.call(element, event)
3884     };
3885
3886     wrapper.handler = handler;
3887     c.push(wrapper);
3888     return wrapper;
3889   }
3890
3891   function findWrapper(id, eventName, handler) {
3892     var c = getWrappersForEventName(id, eventName);
3893     return c.find(function(wrapper) { return wrapper.handler == handler });
3894   }
3895
3896   function destroyWrapper(id, eventName, handler) {
3897     var c = getCacheForID(id);
3898     if (!c[eventName]) return false;
3899     c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
3900   }
3901
3902   function destroyCache() {
3903     for (var id in cache)
3904       for (var eventName in cache[id])
3905         cache[id][eventName] = null;
3906   }
3907
3908   if (window.attachEvent) {
3909     window.attachEvent("onunload", destroyCache);
3910   }
3911
3912   return {
3913     observe: function(element, eventName, handler) {
3914       element = $(element);
3915       var name = getDOMEventName(eventName);
3916
3917       var wrapper = createWrapper(element, eventName, handler);
3918       if (!wrapper) return element;
3919
3920       if (element.addEventListener) {
3921         element.addEventListener(name, wrapper, false);
3922       } else {
3923         element.attachEvent("on" + name, wrapper);
3924       }
3925
3926       return element;
3927     },
3928
3929     stopObserving: function(element, eventName, handler) {
3930       element = $(element);
3931       var id = getEventID(element), name = getDOMEventName(eventName);
3932
3933       if (!handler && eventName) {
3934         getWrappersForEventName(id, eventName).each(function(wrapper) {
3935           element.stopObserving(eventName, wrapper.handler);
3936         });
3937         return element;
3938
3939       } else if (!eventName) {
3940         Object.keys(getCacheForID(id)).each(function(eventName) {
3941           element.stopObserving(eventName);
3942         });
3943         return element;
3944       }
3945
3946       var wrapper = findWrapper(id, eventName, handler);
3947       if (!wrapper) return element;
3948
3949       if (element.removeEventListener) {
3950         element.removeEventListener(name, wrapper, false);
3951       } else {
3952         element.detachEvent("on" + name, wrapper);
3953       }
3954
3955       destroyWrapper(id, eventName, handler);
3956
3957       return element;
3958     },
3959
3960     fire: function(element, eventName, memo) {
3961       element = $(element);
3962       if (element == document && document.createEvent && !element.dispatchEvent)
3963         element = document.documentElement;
3964
3965       if (document.createEvent) {
3966         var event = document.createEvent("HTMLEvents");
3967         event.initEvent("dataavailable", true, true);
3968       } else {
3969         var event = document.createEventObject();
3970         event.eventType = "ondataavailable";
3971       }
3972
3973       event.eventName = eventName;
3974       event.memo = memo || { };
3975
3976       if (document.createEvent) {
3977         element.dispatchEvent(event);
3978       } else {
3979         element.fireEvent(event.eventType, event);
3980       }
3981
3982       return Event.extend(event);
3983     }
3984   };
3985 })());
3986
3987 Object.extend(Event, Event.Methods);
3988
3989 Element.addMethods({
3990   fire:          Event.fire,
3991   observe:       Event.observe,
3992   stopObserving: Event.stopObserving
3993 });
3994
3995 Object.extend(document, {
3996   fire:          Element.Methods.fire.methodize(),
3997   observe:       Element.Methods.observe.methodize(),
3998   stopObserving: Element.Methods.stopObserving.methodize()
3999 });
4000
4001 (function() {
4002   /* Support for the DOMContentLoaded event is based on work by Dan Webb,
4003      Matthias Miller, Dean Edwards and John Resig. */
4004
4005   var timer, fired = false;
4006
4007   function fireContentLoadedEvent() {
4008     if (fired) return;
4009     if (timer) window.clearInterval(timer);
4010     document.fire("dom:loaded");
4011     fired = true;
4012   }
4013
4014   if (document.addEventListener) {
4015     if (Prototype.Browser.WebKit) {
4016       timer = window.setInterval(function() {
4017         if (/loaded|complete/.test(document.readyState))
4018           fireContentLoadedEvent();
4019       }, 0);
4020
4021       Event.observe(window, "load", fireContentLoadedEvent);
4022
4023     } else {
4024       document.addEventListener("DOMContentLoaded",
4025         fireContentLoadedEvent, false);
4026     }
4027
4028   } else {
4029     document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
4030     $("__onDOMContentLoaded").onreadystatechange = function() {
4031       if (this.readyState == "complete") {
4032         this.onreadystatechange = null;
4033         fireContentLoadedEvent();
4034       }
4035     };
4036   }
4037 })();
4038 /*------------------------------- DEPRECATED -------------------------------*/
4039
4040 Hash.toQueryString = Object.toQueryString;
4041
4042 var Toggle = { display: Element.toggle };
4043
4044 Element.Methods.childOf = Element.Methods.descendantOf;
4045
4046 var Insertion = {
4047   Before: function(element, content) {
4048     return Element.insert(element, {before:content});
4049   },
4050
4051   Top: function(element, content) {
4052     return Element.insert(element, {top:content});
4053   },
4054
4055   Bottom: function(element, content) {
4056     return Element.insert(element, {bottom:content});
4057   },
4058
4059   After: function(element, content) {
4060     return Element.insert(element, {after:content});
4061   }
4062 };
4063
4064 var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
4065
4066 // This should be moved to script.aculo.us; notice the deprecated methods
4067 // further below, that map to the newer Element methods.
4068 var Position = {
4069   // set to true if needed, warning: firefox performance problems
4070   // NOT neeeded for page scrolling, only if draggable contained in
4071   // scrollable elements
4072   includeScrollOffsets: false,
4073
4074   // must be called before calling withinIncludingScrolloffset, every time the
4075   // page is scrolled
4076   prepare: function() {
4077     this.deltaX =  window.pageXOffset
4078                 || document.documentElement.scrollLeft
4079                 || document.body.scrollLeft
4080                 || 0;
4081     this.deltaY =  window.pageYOffset
4082                 || document.documentElement.scrollTop
4083                 || document.body.scrollTop
4084                 || 0;
4085   },
4086
4087   // caches x/y coordinate pair to use with overlap
4088   within: function(element, x, y) {
4089     if (this.includeScrollOffsets)
4090       return this.withinIncludingScrolloffsets(element, x, y);
4091     this.xcomp = x;
4092     this.ycomp = y;
4093     this.offset = Element.cumulativeOffset(element);
4094
4095     return (y >= this.offset[1] &&
4096             y <  this.offset[1] + element.offsetHeight &&
4097             x >= this.offset[0] &&
4098             x <  this.offset[0] + element.offsetWidth);
4099   },
4100
4101   withinIncludingScrolloffsets: function(element, x, y) {
4102     var offsetcache = Element.cumulativeScrollOffset(element);
4103
4104     this.xcomp = x + offsetcache[0] - this.deltaX;
4105     this.ycomp = y + offsetcache[1] - this.deltaY;
4106     this.offset = Element.cumulativeOffset(element);
4107
4108     return (this.ycomp >= this.offset[1] &&
4109             this.ycomp <  this.offset[1] + element.offsetHeight &&
4110             this.xcomp >= this.offset[0] &&
4111             this.xcomp <  this.offset[0] + element.offsetWidth);
4112   },
4113
4114   // within must be called directly before
4115   overlap: function(mode, element) {
4116     if (!mode) return 0;
4117     if (mode == 'vertical')
4118       return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
4119         element.offsetHeight;
4120     if (mode == 'horizontal')
4121       return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
4122         element.offsetWidth;
4123   },
4124
4125   // Deprecation layer -- use newer Element methods now (1.5.2).
4126
4127   cumulativeOffset: Element.Methods.cumulativeOffset,
4128
4129   positionedOffset: Element.Methods.positionedOffset,
4130
4131   absolutize: function(element) {
4132     Position.prepare();
4133     return Element.absolutize(element);
4134   },
4135
4136   relativize: function(element) {
4137     Position.prepare();
4138     return Element.relativize(element);
4139   },
4140
4141   realOffset: Element.Methods.cumulativeScrollOffset,
4142
4143   offsetParent: Element.Methods.getOffsetParent,
4144
4145   page: Element.Methods.viewportOffset,
4146
4147   clone: function(source, target, options) {
4148     options = options || { };
4149     return Element.clonePosition(target, source, options);
4150   }
4151 };
4152
4153 /*--------------------------------------------------------------------------*/
4154
4155 if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
4156   function iter(name) {
4157     return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
4158   }
4159
4160   instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
4161   function(element, className) {
4162     className = className.toString().strip();
4163     var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
4164     return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
4165   } : function(element, className) {
4166     className = className.toString().strip();
4167     var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
4168     if (!classNames && !className) return elements;
4169
4170     var nodes = $(element).getElementsByTagName('*');
4171     className = ' ' + className + ' ';
4172
4173     for (var i = 0, child, cn; child = nodes[i]; i++) {
4174       if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
4175           (classNames && classNames.all(function(name) {
4176             return !name.toString().blank() && cn.include(' ' + name + ' ');
4177           }))))
4178         elements.push(Element.extend(child));
4179     }
4180     return elements;
4181   };
4182
4183   return function(className, parentElement) {
4184     return $(parentElement || document.body).getElementsByClassName(className);
4185   };
4186 }(Element.Methods);
4187
4188 /*--------------------------------------------------------------------------*/
4189
4190 Element.ClassNames = Class.create();
4191 Element.ClassNames.prototype = {
4192   initialize: function(element) {
4193     this.element = $(element);
4194   },
4195
4196   _each: function(iterator) {
4197     this.element.className.split(/\s+/).select(function(name) {
4198       return name.length > 0;
4199     })._each(iterator);
4200   },
4201
4202   set: function(className) {
4203     this.element.className = className;
4204   },
4205
4206   add: function(classNameToAdd) {
4207     if (this.include(classNameToAdd)) return;
4208     this.set($A(this).concat(classNameToAdd).join(' '));
4209   },
4210
4211   remove: function(classNameToRemove) {
4212     if (!this.include(classNameToRemove)) return;
4213     this.set($A(this).without(classNameToRemove).join(' '));
4214   },
4215
4216   toString: function() {
4217     return $A(this).join(' ');
4218   }
4219 };
4220
4221 Object.extend(Element.ClassNames.prototype, Enumerable);
4222
4223 /*--------------------------------------------------------------------------*/
4224
4225 Element.addMethods();