prototype.js

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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
9var 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
36if (Prototype.Browser.MobileSafari)
37  Prototype.BrowserFeatures.SpecificElementExtensions = false;
38
39
40/* Based on Alex Arnell's inheritance implementation. */
41var Class = {
42  create: function() {
43    var parent = null, properties = $A(arguments);
44    if (Object.isFunction(properties[0]))
45      parent = properties.shift();
46
47    function klass() {
48      this.initialize.apply(this, arguments);
49    }
50
51    Object.extend(klass, Class.Methods);
52    klass.superclass = parent;
53    klass.subclasses = [];
54
55    if (parent) {
56      var subclass = function() { };
57      subclass.prototype = parent.prototype;
58      klass.prototype = new subclass;
59      parent.subclasses.push(klass);
60    }
61
62    for (var i = 0; i < properties.length; i++)
63      klass.addMethods(properties[i]);
64
65    if (!klass.prototype.initialize)
66      klass.prototype.initialize = Prototype.emptyFunction;
67
68    klass.prototype.constructor = klass;
69
70    return klass;
71  }
72};
73
74Class.Methods = {
75  addMethods: function(source) {
76    var ancestor   = this.superclass && this.superclass.prototype;
77    var properties = Object.keys(source);
78
79    if (!Object.keys({ toString: true }).length)
80      properties.push("toString", "valueOf");
81
82    for (var i = 0, length = properties.length; i < length; i++) {
83      var property = properties[i], value = source[property];
84      if (ancestor && Object.isFunction(value) &&
85          value.argumentNames().first() == "$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
100var Abstract = { };
101
102Object.extend = function(destination, source) {
103  for (var property in source)
104    destination[property] = source[property];
105  return destination;
106};
107
108Object.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
198Object.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($A(arguments)));
246    };
247  }
248});
249
250Function.prototype.defer = Function.prototype.delay.curry(0.01);
251
252Date.prototype.toJSON = function() {
253  return '"' + this.getUTCFullYear() + '-' +
254    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
255    this.getUTCDate().toPaddedString(2) + 'T' +
256    this.getUTCHours().toPaddedString(2) + ':' +
257    this.getUTCMinutes().toPaddedString(2) + ':' +
258    this.getUTCSeconds().toPaddedString(2) + 'Z"';
259};
260
261var Try = {
262  these: function() {
263    var returnValue;
264
265    for (var i = 0, length = arguments.length; i < length; i++) {
266      var lambda = arguments[i];
267      try {
268        returnValue = lambda();
269        break;
270      } catch (e) { }
271    }
272
273    return returnValue;
274  }
275};
276
277RegExp.prototype.match = RegExp.prototype.test;
278
279RegExp.escape = function(str) {
280  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
281};
282
283/*--------------------------------------------------------------------------*/
284
285var 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});
319Object.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
333Object.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
527if (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
536String.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
542String.prototype.parseQuery = String.prototype.toQueryParams;
543
544Object.extend(String.prototype.escapeHTML, {
545  div:  document.createElement('div'),
546  text: document.createTextNode('')
547});
548
549with (String.prototype.escapeHTML) div.appendChild(text);
550
551var 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});
584Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
585
586var $break = { };
587
588var 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
796Object.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});
806function $A(iterable) {
807  if (!iterable) return [];
808  if (iterable.toArray) return iterable.toArray();
809  var length = iterable.length || 0, results = new Array(length);
810  while (length--) results[length] = iterable[length];
811  return results;
812}
813
814if (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 || 0, results = new Array(length);
820    while (length--) results[length] = iterable[length];
821    return results;
822  }
823}
824
825Array.from = $A;
826
827Object.extend(Array.prototype, Enumerable);
828
829if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
830
831Object.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 >

875 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
915if (Object.isFunction(Array.prototype.forEach))
916  Array.prototype._each = Array.prototype.forEach;
917
918if (!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
927if (!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
933Array.prototype.toArray = Array.prototype.clone;
934
935function $w(string) {
936  if (!Object.isString(string)) return [];
937  string = string.strip();
938  return string ? string.split(/\s+/) : [];
939}
940
941if (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}
956Object.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});
983function $H(object) {
984  return new Hash(object);
985};
986
987var 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
1080Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
1081Hash.from = $H;
1082var 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
1106var $R = function(start, end, exclusive) {
1107  return new ObjectRange(start, end, exclusive);
1108};
1109
1110var 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
1122Ajax.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
1149Object.extend(Ajax.Responders, Enumerable);
1150
1151Ajax.Responders.register({
1152  onCreate:   function() { Ajax.activeRequestCount++ },

1153  onComplete: function() { Ajax.activeRequestCount-- }
1154});
1155
1156Ajax.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
1178Ajax.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) || null;
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
1339Ajax.Request.Events =
1340  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
1341
1342Ajax.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
1414Ajax.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

1450Ajax.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});
1490function $(element) {
1491  if (arguments.length > 1) {
1492    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
1493      elements.push($(arguments[i]));
1494    return elements;
1495  }
1496  if (Object.isString(element))
1497    element = document.getElementById(element);
1498  return Element.extend(element);
1499}
1500
1501if (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
1514if (!window.Node) var Node = { };
1515
1516if (!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
1551Element.cache = { };
1552
1553Element.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, insert, tagName, childNodes;
1612
1613    for (position in insertions) {
1614      content  = insertions[position];
1615      position = position.toLowerCase();
1616      insert = Element._insertionTranslations[position];
1617
1618      if (content && content.toElement) content = content.toElement();
1619      if (Object.isElement(content)) {
1620        insert(element, content);
1621        continue;
1622      }
1623
1624      content = Object.toHTML(content);
1625
1626      tagName = ((position == 'before' || position == 'after')
1627        ? element.parentNode : element).tagName.toUpperCase();
1628
1629      childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
1630
1631      if (position == 'top' || position == 'after') childNodes.reverse();
1632      childNodes.each(insert.curry(element));
1633
1634      content.evalScripts.bind(content).defer();
1635    }
1636
1637    return element;
1638  },
1639
1640  wrap: function(element, wrapper, attributes) {
1641    element = $(element);
1642    if (Object.isElement(wrapper))
1643      $(wrapper).writeAttribute(attributes || { });
1644    else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
1645    else wrapper = new Element('div', wrapper);
1646    if (element.parentNode)
1647      element.parentNode.replaceChild(wrapper, element);
1648    wrapper.appendChild(element);
1649    return wrapper;
1650  },
1651
1652  inspect: function(element) {
1653    element = $(element);
1654    var result = '<' + element.tagName.toLowerCase();
1655    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
1656      var property = pair.first(), attribute = pair.last();
1657      var value = (element[property] || '').toString();
1658      if (value) result += ' ' + attribute + '=' + value.inspect(true);
1659    });
1660    return result + '>';
1661  },
1662
1663  recursivelyCollect: function(element, property) {
1664    element = $(element);
1665    var elements = [];
1666    while (element = element[property])
1667      if (element.nodeType == 1)
1668        elements.push(Element.extend(element));
1669    return elements;
1670  },
1671
1672  ancestors: function(element) {
1673    return $(element).recursivelyCollect('parentNode');
1674  },
1675
1676  descendants: function(element) {
1677    return $(element).getElementsBySelector("*");
1678  },
1679
1680  firstDescendant: function(element) {
1681    element = $(element).firstChild;
1682    while (element && element.nodeType != 1) element = element.nextSibling;
1683    return $(element);
1684  },
1685
1686  immediateDescendants: function(element) {
1687    if (!(element = $(element).firstChild)) return [];
1688    while (element && element.nodeType != 1) element = element.nextSibling;
1689    if (element) return [element].concat($(element).nextSiblings());
1690    return [];
1691  },
1692
1693  previousSiblings: function(element) {
1694    return $(element).recursivelyCollect('previousSibling');
1695  },
1696
1697  nextSiblings: function(element) {
1698    return $(element).recursivelyCollect('nextSibling');
1699  },
1700
1701  siblings: function(element) {
1702    element = $(element);
1703    return element.previousSiblings().reverse().concat(element.nextSiblings());
1704  },
1705
1706  match: function(element, selector) {
1707    if (Object.isString(selector))
1708      selector = new Selector(selector);
1709    return selector.match($(element));
1710  },
1711
1712  up: function(element, expression, index) {
1713    element = $(element);
1714    if (arguments.length == 1) return $(element.parentNode);
1715    var ancestors = element.ancestors();
1716    return Object.isNumber(expression) ? ancestors[expression] :
1717      Selector.findElement(ancestors, expression, index);
1718  },
1719
1720  down: function(element, expression, index) {
1721    element = $(element);
1722    if (arguments.length == 1) return element.firstDescendant();
1723    return Object.isNumber(expression) ? element.descendants()[expression] :
1724      element.select(expression)[index || 0];
1725  },
1726
1727  previous: function(element, expression, index) {
1728    element = $(element);
1729    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
1730    var previousSiblings = element.previousSiblings();
1731    return Object.isNumber(expression) ? previousSiblings[expression] :
1732      Selector.findElement(previousSiblings, expression, index);
1733  },
1734
1735  next: function(element, expression, index) {
1736    element = $(element);
1737    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
1738    var nextSiblings = element.nextSiblings();
1739    return Object.isNumber(expression) ? nextSiblings[expression] :
1740      Selector.findElement(nextSiblings, expression, index);
1741  },
1742
1743  select: function() {
1744    var args = $A(arguments), element = $(args.shift());
1745    return Selector.findChildElements(element, args);
1746  },
1747
1748  adjacent: function() {
1749    var args = $A(arguments), element = $(args.shift());
1750    return Selector.findChildElements(element.parentNode, args).without(element);
1751  },
1752
1753  identify: function(element) {
1754    element = $(element);
1755    var id = element.readAttribute('id'), self = arguments.callee;
1756    if (id) return id;
1757    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
1758    element.writeAttribute('id', id);
1759    return id;
1760  },
1761
1762  readAttribute: function(element, name) {
1763    element = $(element);
1764    if (Prototype.Browser.IE) {
1765      var t = Element._attributeTranslations.read;
1766      if (t.values[name]) return t.values[name](element, name);
1767      if (t.names[name]) name = t.names[name];
1768      if (name.include(':')) {
1769        return (!element.attributes || !element.attributes[name]) ? null :
1770         element.attributes[name].value;
1771      }
1772    }
1773    return element.getAttribute(name);
1774  },
1775
1776  writeAttribute: function(element, name, value) {
1777    element = $(element);
1778    var attributes = { }, t = Element._attributeTranslations.write;
1779
1780    if (typeof name == 'object') attributes = name;
1781    else attributes[name] = Object.isUndefined(value) ? true : value;
1782
1783    for (var attr in attributes) {
1784      name = t.names[attr] || attr;
1785      value = attributes[attr];
1786      if (t.values[attr]) name = t.values[attr](element, value);
1787      if (value === false || value === null)
1788        element.removeAttribute(name);
1789      else if (value === true)
1790        element.setAttribute(name, name);
1791      else element.setAttribute(name, value);
1792    }
1793    return element;
1794  },
1795
1796  getHeight: function(element) {
1797    return $(element).getDimensions().height;
1798  },
1799
1800  getWidth: function(element) {
1801    return $(element).getDimensions().width;
1802  },
1803
1804  classNames: function(element) {
1805    return new Element.ClassNames(element);
1806  },
1807
1808  hasClassName: function(element, className) {
1809    if (!(element = $(element))) return;
1810    var elementClassName = element.className;
1811    return (elementClassName.length > 0 && (elementClassName == className ||
1812      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
1813  },
1814
1815  addClassName: function(element, className) {
1816    if (!(element = $(element))) return;
1817    if (!element.hasClassName(className))
1818      element.className += (element.className ? ' ' : '') + className;
1819    return element;
1820  },
1821
1822  removeClassName: function(element, className) {
1823    if (!(element = $(element))) return;
1824    element.className = element.className.replace(
1825      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
1826    return element;
1827  },
1828
1829  toggleClassName: function(element, className) {
1830    if (!(element = $(element))) return;
1831    return element[element.hasClassName(className) ?
1832      'removeClassName' : 'addClassName'](className);
1833  },
1834
1835  // removes whitespace-only text node children
1836  cleanWhitespace: function(element) {
1837    element = $(element);
1838    var node = element.firstChild;
1839    while (node) {
1840      var nextNode = node.nextSibling;
1841      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
1842        element.removeChild(node);
1843      node = nextNode;
1844    }
1845    return element;
1846  },
1847
1848  empty: function(element) {
1849    return $(element).innerHTML.blank();
1850  },
1851
1852  descendantOf: function(element, ancestor) {
1853    element = $(element), ancestor = $(ancestor);
1854    var originalAncestor = ancestor;
1855
1856    if (element.compareDocumentPosition)
1857      return (element.compareDocumentPosition(ancestor) & 8) === 8;
1858
1859    if (element.sourceIndex && !Prototype.Browser.Opera) {
1860      var e = element.sourceIndex, a = ancestor.sourceIndex,
1861       nextAncestor = ancestor.nextSibling;
1862      if (!nextAncestor) {
1863        do { ancestor = ancestor.parentNode; }
1864        while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
1865      }
1866      if (nextAncestor) return (e > a && e < nextAncestor.sourceIndex);
1867    }
1868
1869    while (element = element.parentNode)
1870      if (element == originalAncestor) return true;
1871    return false;

1872  },
1873
1874  scrollTo: function(element) {
1875    element = $(element);
1876    var pos = element.cumulativeOffset();
1877    window.scrollTo(pos[0], pos[1]);
1878    return element;
1879  },
1880
1881  getStyle: function(element, style) {
1882    element = $(element);
1883    style = style == 'float' ? 'cssFloat' : style.camelize();
1884    var value = element.style[style];
1885    if (!value) {
1886      var css = document.defaultView.getComputedStyle(element, null);
1887      value = css ? css[style] : null;
1888    }
1889    if (style == 'opacity') return value ? parseFloat(value) : 1.0;
1890    return value == 'auto' ? null : value;
1891  },
1892
1893  getOpacity: function(element) {
1894    return $(element).getStyle('opacity');
1895  },
1896
1897  setStyle: function(element, styles) {
1898    element = $(element);
1899    var elementStyle = element.style, match;
1900    if (Object.isString(styles)) {
1901      element.style.cssText += ';' + styles;
1902      return styles.include('opacity') ?
1903        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
1904    }
1905    for (var property in styles)
1906      if (property == 'opacity') element.setOpacity(styles[property]);
1907      else
1908        elementStyle[(property == 'float' || property == 'cssFloat') ?
1909          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
1910            property] = styles[property];
1911
1912    return element;
1913  },
1914
1915  setOpacity: function(element, value) {
1916    element = $(element);
1917    element.style.opacity = (value == 1 || value === '') ? '' :
1918      (value < 0.00001) ? 0 : value;
1919    return element;
1920  },
1921
1922  getDimensions: function(element) {
1923    element = $(element);
1924    var display = $(element).getStyle('display');
1925    if (display != 'none' && display != null) // Safari bug
1926      return {width: element.offsetWidth, height: element.offsetHeight};
1927
1928    // All *Width and *Height properties give 0 on elements with display none,
1929    // so enable the element temporarily
1930    var els = element.style;
1931    var originalVisibility = els.visibility;
1932    var originalPosition = els.position;
1933    var originalDisplay = els.display;
1934    els.visibility = 'hidden';
1935    els.position = 'absolute';
1936    els.display = 'block';
1937    var originalWidth = element.clientWidth;
1938    var originalHeight = element.clientHeight;
1939    els.display = originalDisplay;
1940    els.position = originalPosition;
1941    els.visibility = originalVisibility;
1942    return {width: originalWidth, height: originalHeight};
1943  },
1944
1945  makePositioned: function(element) {
1946    element = $(element);
1947    var pos = Element.getStyle(element, 'position');
1948    if (pos == 'static' || !pos) {
1949      element._madePositioned = true;
1950      element.style.position = 'relative';
1951      // Opera returns the offset relative to the positioning context, when an
1952      // element is position relative but top and left have not been defined
1953      if (window.opera) {
1954        element.style.top = 0;
1955        element.style.left = 0;
1956      }
1957    }
1958    return element;
1959  },
1960
1961  undoPositioned: function(element) {
1962    element = $(element);
1963    if (element._madePositioned) {
1964      element._madePositioned = undefined;
1965      element.style.position =
1966        element.style.top =
1967        element.style.left =
1968        element.style.bottom =
1969        element.style.right = '';
1970    }
1971    return element;
1972  },
1973
1974  makeClipping: function(element) {
1975    element = $(element);
1976    if (element._overflow) return element;
1977    element._overflow = Element.getStyle(element, 'overflow') || 'auto';
1978    if (element._overflow !== 'hidden')
1979      element.style.overflow = 'hidden';
1980    return element;
1981  },
1982
1983  undoClipping: function(element) {
1984    element = $(element);
1985    if (!element._overflow) return element;
1986    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
1987    element._overflow = null;
1988    return element;
1989  },
1990
1991  cumulativeOffset: function(element) {
1992    var valueT = 0, valueL = 0;
1993    do {
1994      valueT += element.offsetTop  || 0;
1995      valueL += element.offsetLeft || 0;
1996      element = element.offsetParent;
1997    } while (element);
1998    return Element._returnOffset(valueL, valueT);
1999  },
2000
2001  positionedOffset: function(element) {
2002    var valueT = 0, valueL = 0;
2003    do {
2004      valueT += element.offsetTop  || 0;
2005      valueL += element.offsetLeft || 0;
2006      element = element.offsetParent;
2007      if (element) {
2008        if (element.tagName == 'BODY') break;
2009        var p = Element.getStyle(element, 'position');
2010        if (p == 'relative' || p == 'absolute') break;
2011      }
2012    } while (element);
2013    return Element._returnOffset(valueL, valueT);
2014  },
2015
2016  absolutize: function(element) {
2017    element = $(element);
2018    if (element.getStyle('position') == 'absolute') return;
2019    // Position.prepare(); // To be done manually by Scripty when it needs it.
2020
2021    var offsets = element.positionedOffset();
2022    var top     = offsets[1];
2023    var left    = offsets[0];
2024    var width   = element.clientWidth;
2025    var height  = element.clientHeight;
2026
2027    element._originalLeft   = left - parseFloat(element.style.left  || 0);
2028    element._originalTop    = top  - parseFloat(element.style.top || 0);
2029    element._originalWidth  = element.style.width;
2030    element._originalHeight = element.style.height;
2031
2032    element.style.position = 'absolute';
2033    element.style.top    = top + 'px';
2034    element.style.left   = left + 'px';
2035    element.style.width  = width + 'px';
2036    element.style.height = height + 'px';
2037    return element;
2038  },
2039
2040  relativize: function(element) {
2041    element = $(element);
2042    if (element.getStyle('position') == 'relative') return;
2043    // Position.prepare(); // To be done manually by Scripty when it needs it.
2044
2045    element.style.position = 'relative';
2046    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
2047    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
2048
2049    element.style.top    = top + 'px';
2050    element.style.left   = left + 'px';
2051    element.style.height = element._originalHeight;
2052    element.style.width  = element._originalWidth;
2053    return element;
2054  },
2055
2056  cumulativeScrollOffset: function(element) {
2057    var valueT = 0, valueL = 0;
2058    do {
2059      valueT += element.scrollTop  || 0;
2060      valueL += element.scrollLeft || 0;
2061      element = element.parentNode;
2062    } while (element);
2063    return Element._returnOffset(valueL, valueT);
2064  },
2065
2066  getOffsetParent: function(element) {
2067    if (element.offsetParent) return $(element.offsetParent);
2068    if (element == document.body) return $(element);
2069
2070    while ((element = element.parentNode) && element != document.body)
2071      if (Element.getStyle(element, 'position') != 'static')
2072        return $(element);
2073
2074    return $(document.body);
2075  },
2076
2077  viewportOffset: function(forElement) {
2078    var valueT = 0, valueL = 0;
2079
2080    var element = forElement;
2081    do {
2082      valueT += element.offsetTop  || 0;
2083      valueL += element.offsetLeft || 0;
2084
2085      // Safari fix
2086      if (element.offsetParent == document.body &&
2087        Element.getStyle(element, 'position') == 'absolute') break;
2088
2089    } while (element = element.offsetParent);
2090
2091    element = forElement;
2092    do {
2093      if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
2094        valueT -= element.scrollTop  || 0;
2095        valueL -= element.scrollLeft || 0;
2096      }
2097    } while (element = element.parentNode);
2098
2099    return Element._returnOffset(valueL, valueT);
2100  },
2101
2102  clonePosition: function(element, source) {
2103    var options = Object.extend({
2104      setLeft:    true,
2105      setTop:     true,
2106      setWidth:   true,
2107      setHeight:  true,
2108      offsetTop:  0,
2109      offsetLeft: 0
2110    }, arguments[2] || { });
2111
2112    // find page position of source
2113    source = $(source);
2114    var p = source.viewportOffset();
2115
2116    // find coordinate system to use
2117    element = $(element);
2118    var delta = [0, 0];
2119    var parent = null;
2120    // delta [0,0] will do fine with position: fixed elements,
2121    // position:absolute needs offsetParent deltas
2122    if (Element.getStyle(element, 'position') == 'absolute') {
2123      parent = element.getOffsetParent();
2124      delta = parent.viewportOffset();
2125    }
2126
2127    // correct by body offsets (fixes Safari)
2128    if (parent == document.body) {
2129      delta[0] -= document.body.offsetLeft;
2130      delta[1] -= document.body.offsetTop;
2131    }
2132
2133    // set position
2134    if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
2135    if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
2136    if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
2137    if (options.setHeight) element.style.height = source.offsetHeight + 'px';
2138    return element;
2139  }
2140};
2141
2142Element.Methods.identify.counter = 1;
2143
2144Object.extend(Element.Methods, {
2145  getElementsBySelector: Element.Methods.select,
2146  childElements: Element.Methods.immediateDescendants
2147});
2148
2149Element._attributeTranslations = {
2150  write: {
2151    names: {
2152      className: 'class',
2153      htmlFor:   'for'
2154    },
2155    values: { }
2156  }
2157};
2158
2159if (Prototype.Browser.Opera) {
2160  Element.Methods.getStyle = Element.Methods.getStyle.wrap(
2161    function(proceed, element, style) {
2162      switch (style) {
2163        case 'left': case 'top': case 'right': case 'bottom':
2164          if (proceed(element, 'position') === 'static') return null;
2165        case 'height': case 'width':
2166          // returns '0px' for hidden elements; we want it to return null
2167          if (!Element.visible(element)) return null;
2168
2169          // returns the border-box dimensions rather than the content-box
2170          // dimensions, so we subtract padding and borders from the value
2171          var dim = parseInt(proceed(element, style), 10);
2172
2173          if (dim !== element['offset' + style.capitalize()])
2174            return dim + 'px';
2175
2176          var properties;
2177          if (style === 'height') {
2178            properties = ['border-top-width', 'padding-top',
2179             'padding-bottom', 'border-bottom-width'];
2180          }
2181          else {
2182            properties = ['border-left-width', 'padding-left',
2183             'padding-right', 'border-right-width'];
2184          }
2185          return properties.inject(dim, function(memo, property) {
2186            var val = proceed(element, property);
2187            return val === null ? memo : memo - parseInt(val, 10);
2188          }) + 'px';
2189        default: return proceed(element, style);
2190      }
2191    }
2192  );
2193
2194  Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
2195    function(proceed, element, attribute) {
2196      if (attribute === 'title') return element.title;
2197      return proceed(element, attribute);
2198    }
2199  );
2200}
2201
2202else if (Prototype.Browser.IE) {
2203  $w('positionedOffset getOffsetParent viewportOffset').each(function(method) {
2204    Element.Methods[method] = Element.Methods[method].wrap(
2205      function(proceed, element) {
2206        element = $(element);
2207        var position = element.getStyle('position');
2208        if (position != 'static') return proceed(element);
2209        element.setStyle({ position: 'relative' });
2210        var value = proceed(element);
2211        element.setStyle({ position: position });
2212        return value;
2213      }
2214    );
2215  });
2216
2217  Element.Methods.getStyle = function(element, style) {
2218    element = $(element);
2219    style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
2220    var value = element.style[style];
2221    if (!value && element.currentStyle) value = element.currentStyle[style];
2222
2223    if (style == 'opacity') {
2224      if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
2225        if (value[1]) return parseFloat(value[1]) / 100;
2226      return 1.0;
2227    }
2228
2229    if (value == 'auto') {
2230      if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
2231        return element['offset' + style.capitalize()] + 'px';
2232      return null;
2233    }
2234    return value;
2235  };
2236
2237  Element.Methods.setOpacity = function(element, value) {
2238    function stripAlpha(filter){
2239      return filter.replace(/alpha\([^\)]*\)/gi,'');
2240    }
2241    element = $(element);
2242    var currentStyle = element.currentStyle;
2243    if ((currentStyle && !currentStyle.hasLayout) ||
2244      (!currentStyle && element.style.zoom == 'normal'))
2245        element.style.zoom = 1;
2246
2247    var filter = element.getStyle('filter'), style = element.style;
2248    if (value == 1 || value === '') {
2249      (filter = stripAlpha(filter)) ?

2250        style.filter = filter : style.removeAttribute('filter');
2251      return element;
2252    } else if (value < 0.00001) value = 0;
2253    style.filter = stripAlpha(filter) +
2254      'alpha(opacity=' + (value * 100) + ')';
2255    return element;
2256  };
2257
2258  Element._attributeTranslations = {
2259    read: {
2260      names: {
2261        'class': 'className',
2262        'for':   'htmlFor'
2263      },
2264      values: {
2265        _getAttr: function(element, attribute) {
2266          return element.getAttribute(attribute, 2);
2267        },
2268        _getAttrNode: function(element, attribute) {
2269          var node = element.getAttributeNode(attribute);
2270          return node ? node.value : "";
2271        },
2272        _getEv: function(element, attribute) {
2273          attribute = element.getAttribute(attribute);
2274          return attribute ? attribute.toString().slice(23, -2) : null;
2275        },
2276        _flag: function(element, attribute) {
2277          return $(element).hasAttribute(attribute) ? attribute : null;
2278        },
2279        style: function(element) {
2280          return element.style.cssText.toLowerCase();
2281        },
2282        title: function(element) {
2283          return element.title;
2284        }
2285      }
2286    }
2287  };
2288
2289  Element._attributeTranslations.write = {
2290    names: Object.clone(Element._attributeTranslations.read.names),
2291    values: {
2292      checked: function(element, value) {
2293        element.checked = !!value;
2294      },
2295
2296      style: function(element, value) {
2297        element.style.cssText = value ? value : '';
2298      }
2299    }
2300  };
2301
2302  Element._attributeTranslations.has = {};
2303
2304  $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
2305      'encType maxLength readOnly longDesc').each(function(attr) {
2306    Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
2307    Element._attributeTranslations.has[attr.toLowerCase()] = attr;
2308  });
2309
2310  (function(v) {
2311    Object.extend(v, {
2312      href:        v._getAttr,
2313      src:         v._getAttr,
2314      type:        v._getAttr,
2315      action:      v._getAttrNode,
2316      disabled:    v._flag,
2317      checked:     v._flag,
2318      readonly:    v._flag,
2319      multiple:    v._flag,
2320      onload:      v._getEv,
2321      onunload:    v._getEv,
2322      onclick:     v._getEv,
2323      ondblclick:  v._getEv,
2324      onmousedown: v._getEv,
2325      onmouseup:   v._getEv,
2326      onmouseover: v._getEv,
2327      onmousemove: v._getEv,
2328      onmouseout:  v._getEv,
2329      onfocus:     v._getEv,
2330      onblur:      v._getEv,
2331      onkeypress:  v._getEv,
2332      onkeydown:   v._getEv,
2333      onkeyup:     v._getEv,
2334      onsubmit:    v._getEv,
2335      onreset:     v._getEv,
2336      onselect:    v._getEv,
2337      onchange:    v._getEv
2338    });
2339  })(Element._attributeTranslations.read.values);
2340}
2341
2342else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
2343  Element.Methods.setOpacity = function(element, value) {
2344    element = $(element);
2345    element.style.opacity = (value == 1) ? 0.999999 :
2346      (value === '') ? '' : (value < 0.00001) ? 0 : value;
2347    return element;
2348  };
2349}
2350
2351else if (Prototype.Browser.WebKit) {
2352  Element.Methods.setOpacity = function(element, value) {
2353    element = $(element);
2354    element.style.opacity = (value == 1 || value === '') ? '' :
2355      (value < 0.00001) ? 0 : value;
2356
2357    if (value == 1)
2358      if(element.tagName == 'IMG' && element.width) {
2359        element.width++; element.width--;
2360      } else try {
2361        var n = document.createTextNode(' ');
2362        element.appendChild(n);
2363        element.removeChild(n);
2364      } catch (e) { }
2365
2366    return element;
2367  };
2368
2369  // Safari returns margins on body which is incorrect if the child is absolutely
2370  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
2371  // KHTML/WebKit only.
2372  Element.Methods.cumulativeOffset = function(element) {
2373    var valueT = 0, valueL = 0;
2374    do {
2375      valueT += element.offsetTop  || 0;
2376      valueL += element.offsetLeft || 0;
2377      if (element.offsetParent == document.body)
2378        if (Element.getStyle(element, 'position') == 'absolute') break;
2379
2380      element = element.offsetParent;
2381    } while (element);
2382
2383    return Element._returnOffset(valueL, valueT);
2384  };
2385}
2386
2387if (Prototype.Browser.IE || Prototype.Browser.Opera) {
2388  // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
2389  Element.Methods.update = function(element, content) {
2390    element = $(element);
2391
2392    if (content && content.toElement) content = content.toElement();

2393    if (Object.isElement(content)) return element.update().insert(content);
2394
2395    content = Object.toHTML(content);
2396    var tagName = element.tagName.toUpperCase();
2397
2398    if (tagName in Element._insertionTranslations.tags) {
2399      $A(element.childNodes).each(function(node) { element.removeChild(node) });
2400      Element._getContentFromAnonymousElement(tagName, content.stripScripts())
2401        .each(function(node) { element.appendChild(node) });
2402    }
2403    else element.innerHTML = content.stripScripts();
2404
2405    content.evalScripts.bind(content).defer();
2406    return element;
2407  };
2408}
2409
2410if (document.createElement('div').outerHTML) {
2411  Element.Methods.replace = function(element, content) {
2412    element = $(element);
2413
2414    if (content && content.toElement) content = content.toElement();
2415    if (Object.isElement(content)) {
2416      element.parentNode.replaceChild(content, element);
2417      return element;
2418    }
2419
2420    content = Object.toHTML(content);
2421    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
2422
2423    if (Element._insertionTranslations.tags[tagName]) {
2424      var nextSibling = element.next();
2425      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
2426      parent.removeChild(element);
2427      if (nextSibling)
2428        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
2429      else
2430        fragments.each(function(node) { parent.appendChild(node) });
2431    }
2432    else element.outerHTML = content.stripScripts();
2433
2434    content.evalScripts.bind(content).defer();
2435    return element;
2436  };
2437}
2438
2439Element._returnOffset = function(l, t) {
2440  var result = [l, t];
2441  result.left = l;
2442  result.top = t;
2443  return result;
2444};
2445
2446Element._getContentFromAnonymousElement = function(tagName, html) {
2447  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
2448  if (t) {
2449    div.innerHTML = t[0] + html + t[1];
2450    t[2].times(function() { div = div.firstChild });
2451  } else div.innerHTML = html;
2452  return $A(div.childNodes);
2453};
2454
2455Element._insertionTranslations = {
2456  before: function(element, node) {
2457    element.parentNode.insertBefore(node, element);
2458  },
2459  top: function(element, node) {
2460    element.insertBefore(node, element.firstChild);
2461  },
2462  bottom: function(element, node) {
2463    element.appendChild(node);
2464  },
2465  after: function(element, node) {
2466    element.parentNode.insertBefore(node, element.nextSibling);
2467  },
2468  tags: {
2469    TABLE:  ['<table>',                '</table>',                   1],
2470    TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
2471    TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
2472    TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
2473    SELECT: ['<select>',               '</select>',                  1]
2474  }
2475};
2476
2477(function() {
2478  Object.extend(this.tags, {
2479    THEAD: this.tags.TBODY,
2480    TFOOT: this.tags.TBODY,
2481    TH:    this.tags.TD
2482  });
2483}).call(Element._insertionTranslations);
2484
2485Element.Methods.Simulated = {
2486  hasAttribute: function(element, attribute) {
2487    attribute = Element._attributeTranslations.has[attribute] || attribute;
2488    var node = $(element).getAttributeNode(attribute);
2489    return node && node.specified;
2490  }
2491};
2492
2493Element.Methods.ByTag = { };
2494
2495Object.extend(Element, Element.Methods);
2496
2497if (!Prototype.BrowserFeatures.ElementExtensions &&
2498    document.createElement('div').__proto__) {
2499  window.HTMLElement = { };
2500  window.HTMLElement.prototype = document.createElement('div').__proto__;
2501  Prototype.BrowserFeatures.ElementExtensions = true;
2502}
2503
2504Element.extend = (function() {
2505  if (Prototype.BrowserFeatures.SpecificElementExtensions)
2506    return Prototype.K;
2507
2508  var Methods = { }, ByTag = Element.Methods.ByTag;
2509
2510  var extend = Object.extend(function(element) {
2511    if (!element || element._extendedByPrototype ||
2512        element.nodeType != 1 || element == window) return element;
2513
2514    var methods = Object.clone(Methods),
2515      tagName = element.tagName, property, value;
2516
2517    // extend methods for specific tags
2518    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
2519
2520    for (property in methods) {
2521      value = methods[property];
2522      if (Object.isFunction(value) && !(property in element))
2523        element[property] = value.methodize();
2524    }
2525
2526    element._extendedByPrototype = Prototype.emptyFunction;
2527    return element;
2528
2529  }, {
2530    refresh: function() {
2531      // extend methods for all tags (Safari doesn't need this)
2532      if (!Prototype.BrowserFeatures.ElementExtensions) {
2533        Object.extend(Methods, Element.Methods);
2534        Object.extend(Methods, Element.Methods.Simulated);
2535      }
2536    }
2537  });
2538
2539  extend.refresh();
2540  return extend;
2541})();
2542
2543Element.hasAttribute = function(element, attribute) {
2544  if (element.hasAttribute) return element.hasAttribute(attribute);
2545  return Element.Methods.Simulated.hasAttribute(element, attribute);
2546};
2547
2548Element.addMethods = function(methods) {
2549  var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
2550
2551  if (!methods) {
2552    Object.extend(Form, Form.Methods);

2553    Object.extend(Form.Element, Form.Element.Methods);
2554    Object.extend(Element.Methods.ByTag, {
2555      "FORM":     Object.clone(Form.Methods),
2556      "INPUT":    Object.clone(Form.Element.Methods),
2557      "SELECT":   Object.clone(Form.Element.Methods),
2558      "TEXTAREA": Object.clone(Form.Element.Methods)
2559    });
2560  }
2561
2562  if (arguments.length == 2) {
2563    var tagName = methods;
2564    methods = arguments[1];
2565  }
2566
2567  if (!tagName) Object.extend(Element.Methods, methods || { });
2568  else {
2569    if (Object.isArray(tagName)) tagName.each(extend);
2570    else extend(tagName);
2571  }
2572
2573  function extend(tagName) {
2574    tagName = tagName.toUpperCase();
2575    if (!Element.Methods.ByTag[tagName])
2576      Element.Methods.ByTag[tagName] = { };
2577    Object.extend(Element.Methods.ByTag[tagName], methods);
2578  }
2579
2580  function copy(methods, destination, onlyIfAbsent) {
2581    onlyIfAbsent = onlyIfAbsent || false;
2582    for (var property in methods) {
2583      var value = methods[property];
2584      if (!Object.isFunction(value)) continue;
2585      if (!onlyIfAbsent || !(property in destination))
2586        destination[property] = value.methodize();
2587    }
2588  }
2589
2590  function findDOMClass(tagName) {
2591    var klass;
2592    var trans = {
2593      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
2594      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
2595      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
2596      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
2597      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
2598      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
2599      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
2600      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
2601      "FrameSet", "IFRAME": "IFrame"
2602    };
2603    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
2604    if (window[klass]) return window[klass];
2605    klass = 'HTML' + tagName + 'Element';
2606    if (window[klass]) return window[klass];
2607    klass = 'HTML' + tagName.capitalize() + 'Element';
2608    if (window[klass]) return window[klass];
2609
2610    window[klass] = { };
2611    window[klass].prototype = document.createElement(tagName).__proto__;
2612    return window[klass];
2613  }
2614
2615  if (F.ElementExtensions) {
2616    copy(Element.Methods, HTMLElement.prototype);
2617    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
2618  }
2619
2620  if (F.SpecificElementExtensions) {
2621    for (var tag in Element.Methods.ByTag) {
2622      var klass = findDOMClass(tag);
2623      if (Object.isUndefined(klass)) continue;
2624      copy(T[tag], klass.prototype);
2625    }
2626  }
2627
2628  Object.extend(Element, Element.Methods);
2629  delete Element.ByTag;
2630
2631  if (Element.extend.refresh) Element.extend.refresh();
2632  Element.cache = { };
2633};
2634
2635document.viewport = {
2636  getDimensions: function() {
2637    var dimensions = { };
2638    var B = Prototype.Browser;
2639    $w('width height').each(function(d) {
2640      var D = d.capitalize();
2641      dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
2642        (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
2643    });
2644    return dimensions;
2645  },
2646
2647  getWidth: function() {
2648    return this.getDimensions().width;
2649  },
2650
2651  getHeight: function() {
2652    return this.getDimensions().height;
2653  },
2654
2655  getScrollOffsets: function() {
2656    return Element._returnOffset(
2657      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
2658      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
2659  }
2660};
2661/* Portions of the Selector class are derived from Jack Slocumâs DomQuery,
2662 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
2663 * license.  Please see http://www.yui-ext.com/ for more information. */
2664
2665var Selector = Class.create({
2666  initialize: function(expression) {
2667    this.expression = expression.strip();
2668    this.compileMatcher();
2669  },
2670
2671  shouldUseXPath: function() {
2672    if (!Prototype.BrowserFeatures.XPath) return false;
2673
2674    var e = this.expression;
2675
2676    // Safari 3 chokes on :*-of-type and :empty
2677    if (Prototype.Browser.WebKit &&
2678     (e.include("-of-type") || e.include(":empty")))
2679      return false;

2680
2681    // XPath can't do namespaced attributes, nor can it read
2682    // the "checked" property from DOM nodes
2683    if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
2684      return false;
2685
2686    return true;
2687  },
2688
2689  compileMatcher: function() {
2690    if (this.shouldUseXPath())
2691      return this.compileXPathMatcher();
2692
2693    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
2694        c = Selector.criteria, le, p, m;
2695
2696    if (Selector._cache[e]) {
2697      this.matcher = Selector._cache[e];
2698      return;
2699    }
2700
2701    this.matcher = ["this.matcher = function(root) {",
2702                    "var r = root, h = Selector.handlers, c = false, n;"];
2703
2704    while (e && le != e && (/\S/).test(e)) {
2705      le = e;
2706      for (var i in ps) {
2707        p = ps[i];
2708        if (m = e.match(p)) {
2709          this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
2710    	      new Template(c[i]).evaluate(m));
2711          e = e.replace(m[0], '');
2712          break;
2713        }
2714      }
2715    }
2716
2717    this.matcher.push("return h.unique(n);\n}");
2718    eval(this.matcher.join('\n'));
2719    Selector._cache[this.expression] = this.matcher;
2720  },
2721
2722  compileXPathMatcher: function() {
2723    var e = this.expression, ps = Selector.patterns,
2724        x = Selector.xpath, le, m;
2725
2726    if (Selector._cache[e]) {
2727      this.xpath = Selector._cache[e]; return;
2728    }
2729
2730    this.matcher = ['.//*'];
2731    while (e && le != e && (/\S/).test(e)) {
2732      le = e;
2733      for (var i in ps) {
2734        if (m = e.match(ps[i])) {
2735          this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
2736            new Template(x[i]).evaluate(m));
2737          e = e.replace(m[0], '');
2738          break;
2739        }
2740      }
2741    }
2742
2743    this.xpath = this.matcher.join('');
2744    Selector._cache[this.expression] = this.xpath;
2745  },
2746
2747  findElements: function(root) {
2748    root = root || document;
2749    if (this.xpath) return document._getElementsByXPath(this.xpath, root);
2750    return this.matcher(root);
2751  },
2752
2753  match: function(element) {
2754    this.tokens = [];
2755
2756    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
2757    var le, p, m;
2758
2759    while (e && le !== e && (/\S/).test(e)) {
2760      le = e;
2761      for (var i in ps) {
2762        p = ps[i];
2763        if (m = e.match(p)) {
2764          // use the Selector.assertions methods unless the selector
2765          // is too complex.
2766          if (as[i]) {
2767            this.tokens.push([i, Object.clone(m)]);
2768            e = e.replace(m[0], '');
2769          } else {
2770            // reluctantly do a document-wide search
2771            // and look for a match in the array
2772            return this.findElements(document).include(element);
2773          }
2774        }
2775      }
2776    }
2777
2778    var match = true, name, matches;
2779    for (var i = 0, token; token = this.tokens[i]; i++) {
2780      name = token[0], matches = token[1];
2781      if (!Selector.assertions[name](element, matches)) {
2782        match = false; break;
2783      }
2784    }
2785
2786    return match;
2787  },
2788
2789  toString: function() {
2790    return this.expression;
2791  },
2792
2793  inspect: function() {
2794    return "#<Selector:" + this.expression.inspect() + ">";
2795  }
2796});
2797
2798Object.extend(Selector, {
2799  _cache: { },
2800
2801  xpath: {
2802    descendant:   "//*",
2803    child:        "/*",
2804    adjacent:     "/following-sibling::*[1]",
2805    laterSibling: '/following-sibling::*',
2806    tagName:      function(m) {
2807      if (m[1] == '*') return '';
2808      return "[local-name()='" + m[1].toLowerCase() +
2809             "' or local-name()='" + m[1].toUpperCase() + "']";
2810    },
2811    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
2812    id:           "[@id='#{1}']",
2813    attrPresence: function(m) {
2814      m[1] = m[1].toLowerCase();
2815      return new Template("[@#{1}]").evaluate(m);
2816    },
2817    attr: function(m) {
2818      m[1] = m[1].toLowerCase();
2819      m[3] = m[5] || m[6];
2820      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
2821    },
2822    pseudo: function(m) {
2823      var h = Selector.xpath.pseudos[m[1]];
2824      if (!h) return '';
2825      if (Object.isFunction(h)) return h(m);
2826      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
2827    },
2828    operators: {
2829      '=':  "[@#{1}='#{3}']",
2830      '!=': "[@#{1}!='#{3}']",
2831      '^=': "[starts-with(@#{1}, '#{3}')]",
2832      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
2833      '*=': "[contains(@#{1}, '#{3}')]",
2834      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
2835      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
2836    },
2837    pseudos: {
2838      'first-child': '[not(preceding-sibling::*)]',
2839      'last-child':  '[not(following-sibling::*)]',
2840      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
2841      'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
2842      'checked':     "[@checked]",
2843      'disabled':    "[@disabled]",
2844      'enabled':     "[not(@disabled)]",
2845      'not': function(m) {
2846        var e = m[6], p = Selector.patterns,
2847            x = Selector.xpath, le, v;
2848
2849        var exclusion = [];
2850        while (e && le != e && (/\S/).test(e)) {
2851          le = e;
2852          for (var i in p) {
2853            if (m = e.match(p[i])) {
2854              v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
2855              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
2856              e = e.replace(m[0], '');
2857              break;
2858            }
2859          }
2860        }
2861        return "[not(" + exclusion.join(" and ") + ")]";
2862      },
2863      'nth-child':      function(m) {
2864        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
2865      },
2866      'nth-last-child': function(m) {
2867        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
2868      },
2869      'nth-of-type':    function(m) {
2870        return Selector.xpath.pseudos.nth("position() ", m);
2871      },
2872      'nth-last-of-type': function(m) {
2873        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
2874      },
2875      'first-of-type':  function(m) {
2876        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
2877      },
2878      'last-of-type':   function(m) {
2879        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
2880      },
2881      'only-of-type':   function(m) {
2882        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
2883      },
2884      nth: function(fragment, m) {
2885        var mm, formula = m[6], predicate;
2886        if (formula == 'even') formula = '2n+0';
2887        if (formula == 'odd')  formula = '2n+1';
2888        if (mm = formula.match(/^(\d+)$/)) // digit only
2889          return '[' + fragment + "= " + mm[1] + ']';
2890        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
2891          if (mm[1] == "-") mm[1] = -1;
2892          var a = mm[1] ? Number(mm[1]) : 1;
2893          var b = mm[2] ? Number(mm[2]) : 0;
2894          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
2895          "((#{fragment} - #{b}) div #{a} >= 0)]";
2896          return new Template(predicate).evaluate({
2897            fragment: fragment, a: a, b: b });
2898        }
2899      }
2900    }
2901  },
2902
2903  criteria: {
2904    tagName:      'n = h.tagName(n, r, "#{1}", c);   c = false;',
2905    className:    'n = h.className(n, r, "#{1}", c); c = false;',
2906    id:           'n = h.id(n, r, "#{1}", c);        c = false;',
2907    attrPresence: 'n = h.attrPresence(n, r, "#{1}"); c = false;',
2908    attr: function(m) {
2909      m[3] = (m[5] || m[6]);
2910      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}"); c = false;').evaluate(m);
2911    },
2912    pseudo: function(m) {
2913      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
2914      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
2915    },
2916    descendant:   'c = "descendant";',
2917    child:        'c = "child";',
2918    adjacent:     'c = "adjacent";',
2919    laterSibling: 'c = "laterSibling";'
2920  },
2921
2922  patterns: {

2923    // combinators must be listed first
2924    // (and descendant needs to be last combinator)
2925    laterSibling: /^\s*~\s*/,
2926    child:        /^\s*>\s*/,
2927    adjacent:     /^\s*\+\s*/,
2928    descendant:   /^\s/,
2929
2930    // selectors follow
2931    tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
2932    id:           /^#([\w\-\*]+)(\b|$)/,
2933    className:    /^\.([\w\-\*]+)(\b|$)/,
2934    pseudo:
2935/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
2936    attrPresence: /^\[([\w]+)\]/,
2937    attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
2938  },
2939
2940  // for Selector.match and Element#match
2941  assertions: {
2942    tagName: function(element, matches) {
2943      return matches[1].toUpperCase() == element.tagName.toUpperCase();
2944    },
2945
2946    className: function(element, matches) {
2947      return Element.hasClassName(element, matches[1]);
2948    },
2949
2950    id: function(element, matches) {
2951      return element.id === matches[1];
2952    },
2953
2954    attrPresence: function(element, matches) {
2955      return Element.hasAttribute(element, matches[1]);
2956    },
2957
2958    attr: function(element, matches) {
2959      var nodeValue = Element.readAttribute(element, matches[1]);
2960      return Selector.operators[matches[2]](nodeValue, matches[3]);
2961    }
2962  },
2963
2964  handlers: {
2965    // UTILITY FUNCTIONS
2966    // joins two collections
2967    concat: function(a, b) {
2968      for (var i = 0, node; node = b[i]; i++)
2969        a.push(node);
2970      return a;
2971    },
2972
2973    // marks an array of nodes for counting
2974    mark: function(nodes) {
2975      for (var i = 0, node; node = nodes[i]; i++)
2976        node._counted = true;
2977      return nodes;
2978    },
2979
2980    unmark: function(nodes) {
2981      for (var i = 0, node; node = nodes[i]; i++)
2982        node._counted = undefined;
2983      return nodes;
2984    },
2985
2986    // mark each child node with its position (for nth calls)
2987    // "ofType" flag indicates whether we're indexing for nth-of-type
2988    // rather than nth-child
2989    index: function(parentNode, reverse, ofType) {
2990      parentNode._counted = true;
2991      if (reverse) {
2992        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
2993          var node = nodes[i];
2994          if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
2995        }
2996      } else {
2997        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
2998          if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
2999      }
3000    },
3001
3002    // filters out duplicates and extends all nodes
3003    unique: function(nodes) {
3004      if (nodes.length == 0) return nodes;
3005      var results = [], n;
3006      for (var i = 0, l = nodes.length; i < l; i++)
3007        if (!(n = nodes[i])._counted) {
3008          n._counted = true;
3009          results.push(Element.extend(n));
3010        }
3011      return Selector.handlers.unmark(results);
3012    },
3013
3014    // COMBINATOR FUNCTIONS
3015    descendant: function(nodes) {
3016      var h = Selector.handlers;
3017      for (var i = 0, results = [], node; node = nodes[i]; i++)
3018        h.concat(results, node.getElementsByTagName('*'));
3019      return results;
3020    },
3021
3022    child: function(nodes) {
3023      var h = Selector.handlers;
3024      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3025        for (var j = 0, child; child = node.childNodes[j]; j++)
3026          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
3027      }
3028      return results;
3029    },
3030
3031    adjacent: function(nodes) {
3032      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3033        var next = this.nextElementSibling(node);
3034        if (next) results.push(next);
3035      }
3036      return results;
3037    },
3038
3039    laterSibling: function(nodes) {
3040      var h = Selector.handlers;
3041      for (var i = 0, results = [], node; node = nodes[i]; i++)
3042        h.concat(results, Element.nextSiblings(node));
3043      return results;
3044    },
3045
3046    nextElementSibling: function(node) {
3047      while (node = node.nextSibling)
3048	      if (node.nodeType == 1) return node;
3049      return null;
3050    },
3051
3052    previousElementSibling: function(node) {
3053      while (node = node.previousSibling)
3054        if (node.nodeType == 1) return node;
3055      return null;
3056    },
3057
3058    // TOKEN FUNCTIONS
3059    tagName: function(nodes, root, tagName, combinator) {
3060      var uTagName = tagName.toUpperCase();
3061      var results = [], h = Selector.handlers;
3062      if (nodes) {
3063        if (combinator) {

3064          // fastlane for ordinary descendant combinators
3065          if (combinator == "descendant") {
3066            for (var i = 0, node; node = nodes[i]; i++)
3067              h.concat(results, node.getElementsByTagName(tagName));
3068            return results;
3069          } else nodes = this[combinator](nodes);
3070          if (tagName == "*") return nodes;
3071        }
3072        for (var i = 0, node; node = nodes[i]; i++)
3073          if (node.tagName.toUpperCase() === uTagName) results.push(node);
3074        return results;
3075      } else return root.getElementsByTagName(tagName);
3076    },
3077
3078    id: function(nodes, root, id, combinator) {
3079      var targetNode = $(id), h = Selector.handlers;
3080      if (!targetNode) return [];
3081      if (!nodes && root == document) return [targetNode];
3082      if (nodes) {
3083        if (combinator) {
3084          if (combinator == 'child') {
3085            for (var i = 0, node; node = nodes[i]; i++)
3086              if (targetNode.parentNode == node) return [targetNode];
3087          } else if (combinator == 'descendant') {
3088            for (var i = 0, node; node = nodes[i]; i++)
3089              if (Element.descendantOf(targetNode, node)) return [targetNode];
3090          } else if (combinator == 'adjacent') {
3091            for (var i = 0, node; node = nodes[i]; i++)
3092              if (Selector.handlers.previousElementSibling(targetNode) == node)
3093                return [targetNode];
3094          } else nodes = h[combinator](nodes);
3095        }
3096        for (var i = 0, node; node = nodes[i]; i++)
3097          if (node == targetNode) return [targetNode];
3098        return [];
3099      }
3100      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
3101    },
3102
3103    className: function(nodes, root, className, combinator) {
3104      if (nodes && combinator) nodes = this[combinator](nodes);
3105      return Selector.handlers.byClassName(nodes, root, className);
3106    },
3107
3108    byClassName: function(nodes, root, className) {
3109      if (!nodes) nodes = Selector.handlers.descendant([root]);
3110      var needle = ' ' + className + ' ';
3111      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
3112        nodeClassName = node.className;
3113        if (nodeClassName.length == 0) continue;
3114        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
3115          results.push(node);
3116      }
3117      return results;
3118    },
3119
3120    attrPresence: function(nodes, root, attr) {
3121      if (!nodes) nodes = root.getElementsByTagName("*");
3122      var results = [];
3123      for (var i = 0, node; node = nodes[i]; i++)
3124        if (Element.hasAttribute(node, attr)) results.push(node);
3125      return results;
3126    },
3127
3128    attr: function(nodes, root, attr, value, operator) {
3129      if (!nodes) nodes = root.getElementsByTagName("*");
3130      var handler = Selector.operators[operator], results = [];
3131      for (var i = 0, node; node = nodes[i]; i++) {
3132        var nodeValue = Element.readAttribute(node, attr);
3133        if (nodeValue === null) continue;
3134        if (handler(nodeValue, value)) results.push(node);
3135      }
3136      return results;
3137    },
3138
3139    pseudo: function(nodes, name, value, root, combinator) {
3140      if (nodes && combinator) nodes = this[combinator](nodes);
3141      if (!nodes) nodes = root.getElementsByTagName("*");
3142      return Selector.pseudos[name](nodes, value, root);
3143    }
3144  },
3145
3146  pseudos: {
3147    'first-child': function(nodes, value, root) {
3148      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3149        if (Selector.handlers.previousElementSibling(node)) continue;
3150          results.push(node);
3151      }
3152      return results;
3153    },
3154    'last-child': function(nodes, value, root) {
3155      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3156        if (Selector.handlers.nextElementSibling(node)) continue;
3157          results.push(node);
3158      }
3159      return results;
3160    },
3161    'only-child': function(nodes, value, root) {
3162      var h = Selector.handlers;
3163      for (var i = 0, results = [], node; node = nodes[i]; i++)
3164        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
3165          results.push(node);
3166      return results;
3167    },
3168    'nth-child':        function(nodes, formula, root) {
3169      return Selector.pseudos.nth(nodes, formula, root);
3170    },
3171    'nth-last-child':   function(nodes, formula, root) {
3172      return Selector.pseudos.nth(nodes, formula, root, true);
3173    },
3174    'nth-of-type':      function(nodes, formula, root) {
3175      return Selector.pseudos.nth(nodes, formula, root, false, true);
3176    },
3177    'nth-last-of-type': function(nodes, formula, root) {
3178      return Selector.pseudos.nth(nodes, formula, root, true, true);
3179    },
3180    'first-of-type':    function(nodes, formula, root) {
3181      return Selector.pseudos.nth(nodes, "1", root, false, true);
3182    },
3183    'last-of-type':     function(nodes, formula, root) {
3184      return Selector.pseudos.nth(nodes, "1", root, true, true);
3185    },
3186    'only-of-type':     function(nodes, formula, root) {
3187      var p = Selector.pseudos;

3188      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
3189    },
3190
3191    // handles the an+b logic
3192    getIndices: function(a, b, total) {
3193      if (a == 0) return b > 0 ? [b] : [];
3194      return $R(1, total).inject([], function(memo, i) {
3195        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
3196        return memo;
3197      });
3198    },
3199
3200    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
3201    nth: function(nodes, formula, root, reverse, ofType) {
3202      if (nodes.length == 0) return [];
3203      if (formula == 'even') formula = '2n+0';
3204      if (formula == 'odd')  formula = '2n+1';
3205      var h = Selector.handlers, results = [], indexed = [], m;
3206      h.mark(nodes);
3207      for (var i = 0, node; node = nodes[i]; i++) {
3208        if (!node.parentNode._counted) {
3209          h.index(node.parentNode, reverse, ofType);
3210          indexed.push(node.parentNode);
3211        }
3212      }
3213      if (formula.match(/^\d+$/)) { // just a number
3214        formula = Number(formula);
3215        for (var i = 0, node; node = nodes[i]; i++)
3216          if (node.nodeIndex == formula) results.push(node);
3217      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
3218        if (m[1] == "-") m[1] = -1;
3219        var a = m[1] ? Number(m[1]) : 1;
3220        var b = m[2] ? Number(m[2]) : 0;
3221        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
3222        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
3223          for (var j = 0; j < l; j++)
3224            if (node.nodeIndex == indices[j]) results.push(node);
3225        }
3226      }
3227      h.unmark(nodes);
3228      h.unmark(indexed);
3229      return results;
3230    },
3231
3232    'empty': function(nodes, value, root) {
3233      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3234        // IE treats comments as element nodes
3235        if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
3236        results.push(node);
3237      }
3238      return results;
3239    },
3240
3241    'not': function(nodes, selector, root) {
3242      var h = Selector.handlers, selectorType, m;
3243      var exclusions = new Selector(selector).findElements(root);
3244      h.mark(exclusions);
3245      for (var i = 0, results = [], node; node = nodes[i]; i++)
3246        if (!node._counted) results.push(node);
3247      h.unmark(exclusions);
3248      return results;
3249    },
3250
3251    'enabled': function(nodes, value, root) {
3252      for (var i = 0, results = [], node; node = nodes[i]; i++)
3253        if (!node.disabled) results.push(node);
3254      return results;
3255    },
3256
3257    'disabled': function(nodes, value, root) {
3258      for (var i = 0, results = [], node; node = nodes[i]; i++)
3259        if (node.disabled) results.push(node);
3260      return results;
3261    },
3262
3263    'checked': function(nodes, value, root) {
3264      for (var i = 0, results = [], node; node = nodes[i]; i++)
3265        if (node.checked) results.push(node);
3266      return results;
3267    }
3268  },
3269
3270  operators: {
3271    '=':  function(nv, v) { return nv == v; },
3272    '!=': function(nv, v) { return nv != v; },
3273    '^=': function(nv, v) { return nv.startsWith(v); },
3274    '$=': function(nv, v) { return nv.endsWith(v); },
3275    '*=': function(nv, v) { return nv.include(v); },
3276    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
3277    '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
3278  },
3279
3280  matchElements: function(elements, expression) {
3281    var matches = new Selector(expression).findElements(), h = Selector.handlers;
3282    h.mark(matches);
3283    for (var i = 0, results = [], element; element = elements[i]; i++)
3284      if (element._counted) results.push(element);
3285    h.unmark(matches);
3286    return results;
3287  },
3288
3289  findElement: function(elements, expression, index) {
3290    if (Object.isNumber(expression)) {
3291      index = expression; expression = false;
3292    }
3293    return Selector.matchElements(elements, expression || '*')[index || 0];
3294  },
3295
3296  findChildElements: function(element, expressions) {
3297    var exprs = expressions.join(',');
3298    expressions = [];
3299    exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
3300      expressions.push(m[1].strip());
3301    });
3302    var results = [], h = Selector.handlers;
3303    for (var i = 0, l = expressions.length, selector; i < l; i++) {
3304      selector = new Selector(expressions[i].strip());
3305      h.concat(results, selector.findElements(element));
3306    }
3307    return (l > 1) ? h.unique(results) : results;
3308  }
3309});
3310
3311if (Prototype.Browser.IE) {
3312  // IE returns comment nodes on getElementsByTagName("*").
3313  // Filter them out.
3314  Selector.handlers.concat = function(a, b) {
3315    for (var i = 0, node; node = b[i]; i++)
3316      if (node.tagName !== "!") a.push(node);
3317    return a;
3318  };
3319}
3320
3321function $$() {
3322  return Selector.findChildElements(document, $A(arguments));
3323}
3324var Form = {
3325  reset: function(form) {
3326    $(form).reset();
3327    return form;
3328  },
3329

3330  serializeElements: function(elements, options) {
3331    if (typeof options != 'object') options = { hash: !!options };
3332    else if (Object.isUndefined(options.hash)) options.hash = true;
3333    var key, value, submitted = false, submit = options.submit;
3334
3335    var data = elements.inject({ }, function(result, element) {
3336      if (!element.disabled && element.name) {
3337        key = element.name; value = $(element).getValue();
3338        if (value != null && (element.type != 'submit' || (!submitted &&
3339            submit !== false && (!submit || key == submit) && (submitted = true)))) {
3340          if (key in result) {
3341            // a key is already present; construct an array of values
3342            if (!Object.isArray(result[key])) result[key] = [result[key]];
3343            result[key].push(value);
3344          }
3345          else result[key] = value;
3346        }
3347      }
3348      return result;
3349    });
3350
3351    return options.hash ? data : Object.toQueryString(data);
3352  }
3353};
3354
3355Form.Methods = {
3356  serialize: function(form, options) {
3357    return Form.serializeElements(Form.getElements(form), options);
3358  },
3359
3360  getElements: function(form) {
3361    return $A($(form).getElementsByTagName('*')).inject([],
3362      function(elements, child) {
3363        if (Form.Element.Serializers[child.tagName.toLowerCase()])
3364          elements.push(Element.extend(child));
3365        return elements;
3366      }
3367    );
3368  },
3369
3370  getInputs: function(form, typeName, name) {
3371    form = $(form);
3372    var inputs = form.getElementsByTagName('input');
3373
3374    if (!typeName && !name) return $A(inputs).map(Element.extend);
3375
3376    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
3377      var input = inputs[i];
3378      if ((typeName && input.type != typeName) || (name && input.name != name))
3379        continue;
3380      matchingInputs.push(Element.extend(input));
3381    }
3382
3383    return matchingInputs;
3384  },
3385
3386  disable: function(form) {
3387    form = $(form);
3388    Form.getElements(form).invoke('disable');
3389    return form;
3390  },
3391
3392  enable: function(form) {
3393    form = $(form);
3394    Form.getElements(form).invoke('enable');
3395    return form;
3396  },
3397
3398  findFirstElement: function(form) {
3399    var elements = $(form).getElements().findAll(function(element) {
3400      return 'hidden' != element.type && !element.disabled;
3401    });
3402    var firstByIndex = elements.findAll(function(element) {
3403      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
3404    }).sortBy(function(element) { return element.tabIndex }).first();
3405
3406    return firstByIndex ? firstByIndex : elements.find(function(element) {
3407      return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
3408    });
3409  },
3410
3411  focusFirstElement: function(form) {
3412    form = $(form);
3413    form.findFirstElement().activate();
3414    return form;
3415  },
3416
3417  request: function(form, options) {
3418    form = $(form), options = Object.clone(options || { });
3419
3420    var params = options.parameters, action = form.readAttribute('action') || '';
3421    if (action.blank()) action = window.location.href;
3422    options.parameters = form.serialize(true);
3423
3424    if (params) {
3425      if (Object.isString(params)) params = params.toQueryParams();
3426      Object.extend(options.parameters, params);
3427    }
3428
3429    if (form.hasAttribute('method') && !options.method)
3430      options.method = form.method;
3431
3432    return new Ajax.Request(action, options);
3433  }
3434};
3435
3436/*--------------------------------------------------------------------------*/
3437
3438Form.Element = {
3439  focus: function(element) {
3440    $(element).focus();
3441    return element;
3442  },
3443
3444  select: function(element) {
3445    $(element).select();
3446    return element;
3447  }
3448};
3449
3450Form.Element.Methods = {
3451  serialize: function(element) {
3452    element = $(element);
3453    if (!element.disabled && element.name) {
3454      var value = element.getValue();
3455      if (value != undefined) {
3456        var pair = { };
3457        pair[element.name] = value;
3458        return Object.toQueryString(pair);
3459      }
3460    }
3461    return '';
3462  },
3463
3464  getValue: function(element) {
3465    element = $(element);
3466    var method = element.tagName.toLowerCase();
3467    return Form.Element.Serializers[method](element);
3468  },
3469
3470  setValue: function(element, value) {
3471    element = $(element);
3472    var method = element.tagName.toLowerCase();
3473    Form.Element.Serializers[method](element, value);
3474    return element;
3475  },
3476
3477  clear: function(element) {
3478    $(element).value = '';
3479    return element;
3480  },
3481
3482  present: function(element) {
3483    return $(element).value != '';
3484  },
3485
3486  activate: function(element) {
3487    element = $(element);
3488    try {
3489      element.focus();
3490      if (element.select && (element.tagName.toLowerCase() != 'input' ||
3491          !['button', 'reset', 'submit'].include(element.type)))
3492        element.select();
3493    } catch (e) { }
3494    return element;
3495  },
3496
3497  disable: function(element) {
3498    element = $(element);
3499    element.blur();
3500    element.disabled = true;
3501    return element;
3502  },
3503
3504  enable: function(element) {
3505    element = $(element);
3506    element.disabled = false;

3507    return element;
3508  }
3509};
3510
3511/*--------------------------------------------------------------------------*/
3512
3513var Field = Form.Element;
3514var $F = Form.Element.Methods.getValue;
3515
3516/*--------------------------------------------------------------------------*/
3517
3518Form.Element.Serializers = {
3519  input: function(element, value) {
3520    switch (element.type.toLowerCase()) {
3521      case 'checkbox':
3522      case 'radio':
3523        return Form.Element.Serializers.inputSelector(element, value);
3524      default:
3525        return Form.Element.Serializers.textarea(element, value);
3526    }
3527  },
3528
3529  inputSelector: function(element, value) {
3530    if (Object.isUndefined(value)) return element.checked ? element.value : null;
3531    else element.checked = !!value;
3532  },
3533
3534  textarea: function(element, value) {
3535    if (Object.isUndefined(value)) return element.value;
3536    else element.value = value;
3537  },
3538
3539  select: function(element, index) {
3540    if (Object.isUndefined(index))
3541      return this[element.type == 'select-one' ?
3542        'selectOne' : 'selectMany'](element);
3543    else {
3544      var opt, value, single = !Object.isArray(index);
3545      for (var i = 0, length = element.length; i < length; i++) {
3546        opt = element.options[i];
3547        value = this.optionValue(opt);
3548        if (single) {
3549          if (value == index) {
3550            opt.selected = true;
3551            return;
3552          }
3553        }
3554        else opt.selected = index.include(value);
3555      }
3556    }
3557  },
3558
3559  selectOne: function(element) {
3560    var index = element.selectedIndex;
3561    return index >= 0 ? this.optionValue(element.options[index]) : null;
3562  },
3563
3564  selectMany: function(element) {
3565    var values, length = element.length;
3566    if (!length) return null;
3567
3568    for (var i = 0, values = []; i < length; i++) {
3569      var opt = element.options[i];
3570      if (opt.selected) values.push(this.optionValue(opt));
3571    }
3572    return values;
3573  },
3574
3575  optionValue: function(opt) {
3576    // extend element because hasAttribute may not be native
3577    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
3578  }
3579};
3580
3581/*--------------------------------------------------------------------------*/
3582
3583Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
3584  initialize: function($super, element, frequency, callback) {
3585    $super(callback, frequency);
3586    this.element   = $(element);
3587    this.lastValue = this.getValue();
3588  },
3589
3590  execute: function() {
3591    var value = this.getValue();
3592    if (Object.isString(this.lastValue) && Object.isString(value) ?
3593        this.lastValue != value : String(this.lastValue) != String(value)) {
3594      this.callback(this.element, value);
3595      this.lastValue = value;
3596    }
3597  }
3598});
3599
3600Form.Element.Observer = Class.create(Abstract.TimedObserver, {
3601  getValue: function() {
3602    return Form.Element.getValue(this.element);
3603  }
3604});
3605
3606Form.Observer = Class.create(Abstract.TimedObserver, {
3607  getValue: function() {
3608    return Form.serialize(this.element);
3609  }
3610});
3611
3612/*--------------------------------------------------------------------------*/
3613
3614Abstract.EventObserver = Class.create({
3615  initialize: function(element, callback) {
3616    this.element  = $(element);
3617    this.callback = callback;
3618
3619    this.lastValue = this.getValue();
3620    if (this.element.tagName.toLowerCase() == 'form')
3621      this.registerFormCallbacks();
3622    else
3623      this.registerCallback(this.element);
3624  },
3625
3626  onElementEvent: function() {
3627    var value = this.getValue();
3628    if (this.lastValue != value) {
3629      this.callback(this.element, value);
3630      this.lastValue = value;
3631    }
3632  },
3633
3634  registerFormCallbacks: function() {
3635    Form.getElements(this.element).each(this.registerCallback, this);
3636  },
3637
3638  registerCallback: function(element) {
3639    if (element.type) {
3640      switch (element.type.toLowerCase()) {
3641        case 'checkbox':
3642        case 'radio':
3643          Event.observe(element, 'click', this.onElementEvent.bind(this));
3644          break;
3645        default:
3646          Event.observe(element, 'change', this.onElementEvent.bind(this));
3647          break;
3648      }
3649    }
3650  }
3651});
3652
3653Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
3654  getValue: function() {
3655    return Form.Element.getValue(this.element);
3656  }
3657});
3658
3659Form.EventObserver = Class.create(Abstract.EventObserver, {
3660  getValue: function() {
3661    return Form.serialize(this.element);
3662  }
3663});
3664if (!window.Event) var Event = { };
3665
3666Object.extend(Event, {
3667  KEY_BACKSPACE: 8,
3668  KEY_TAB:       9,
3669  KEY_RETURN:   13,
3670  KEY_ESC:      27,
3671  KEY_LEFT:     37,
3672  KEY_UP:       38,
3673  KEY_RIGHT:    39,
3674  KEY_DOWN:     40,
3675  KEY_DELETE:   46,
3676  KEY_HOME:     36,
3677  KEY_END:      35,
3678  KEY_PAGEUP:   33,
3679  KEY_PAGEDOWN: 34,
3680  KEY_INSERT:   45,
3681
3682  cache: { },
3683
3684  relatedTarget: function(event) {
3685    var element;
3686    switch(event.type) {
3687      case 'mouseover': element = event.fromElement; break;
3688      case 'mouseout':  element = event.toElement;   break;
3689      default: return null;
3690    }
3691    return Element.extend(element);
3692  }
3693});
3694
3695Event.Methods = (function() {
3696  var isButton;
3697
3698  if (Prototype.Browser.IE) {
3699    var buttonMap = { 0: 1, 1: 4, 2: 2 };
3700    isButton = function(event, code) {
3701      return event.button == buttonMap[code];
3702    };
3703
3704  } else if (Prototype.Browser.WebKit) {
3705    isButton = function(event, code) {
3706      switch (code) {
3707        case 0: return event.which == 1 && !event.metaKey;
3708        case 1: return event.which == 1 && event.metaKey;
3709        default: return false;

3710      }
3711    };
3712
3713  } else {
3714    isButton = function(event, code) {
3715      return event.which ? (event.which === code + 1) : (event.button === code);
3716    };
3717  }
3718
3719  return {
3720    isLeftClick:   function(event) { return isButton(event, 0) },
3721    isMiddleClick: function(event) { return isButton(event, 1) },
3722    isRightClick:  function(event) { return isButton(event, 2) },
3723
3724    element: function(event) {
3725      var node = Event.extend(event).target;
3726      return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
3727    },
3728
3729    findElement: function(event, expression) {
3730      var element = Event.element(event);
3731      if (!expression) return element;
3732      var elements = [element].concat(element.ancestors());
3733      return Selector.findElement(elements, expression, 0);
3734    },
3735
3736    pointer: function(event) {
3737      return {
3738        x: event.pageX || (event.clientX +
3739          (document.documentElement.scrollLeft || document.body.scrollLeft)),
3740        y: event.pageY || (event.clientY +
3741          (document.documentElement.scrollTop || document.body.scrollTop))
3742      };
3743    },
3744
3745    pointerX: function(event) { return Event.pointer(event).x },
3746    pointerY: function(event) { return Event.pointer(event).y },
3747
3748    stop: function(event) {
3749      Event.extend(event);
3750      event.preventDefault();
3751      event.stopPropagation();
3752      event.stopped = true;
3753    }
3754  };
3755})();
3756
3757Event.extend = (function() {
3758  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
3759    m[name] = Event.Methods[name].methodize();
3760    return m;
3761  });
3762
3763  if (Prototype.Browser.IE) {
3764    Object.extend(methods, {
3765      stopPropagation: function() { this.cancelBubble = true },
3766      preventDefault:  function() { this.returnValue = false },
3767      inspect: function() { return "[object Event]" }
3768    });
3769
3770    return function(event) {
3771      if (!event) return false;
3772      if (event._extendedByPrototype) return event;
3773
3774      event._extendedByPrototype = Prototype.emptyFunction;
3775      var pointer = Event.pointer(event);
3776      Object.extend(event, {
3777        target: event.srcElement,
3778        relatedTarget: Event.relatedTarget(event),
3779        pageX:  pointer.x,
3780        pageY:  pointer.y
3781      });
3782      return Object.extend(event, methods);
3783    };
3784
3785  } else {
3786    Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
3787    Object.extend(Event.prototype, methods);
3788    return Prototype.K;
3789  }
3790})();
3791
3792Object.extend(Event, (function() {
3793  var cache = Event.cache;
3794
3795  function getEventID(element) {
3796    if (element._eventID) return element._eventID;
3797    arguments.callee.id = arguments.callee.id || 1;
3798    return element._eventID = ++arguments.callee.id;
3799  }
3800
3801  function getDOMEventName(eventName) {
3802    if (eventName && eventName.include(':')) return "dataavailable";
3803    return eventName;
3804  }
3805
3806  function getCacheForID(id) {
3807    return cache[id] = cache[id] || { };
3808  }
3809
3810  function getWrappersForEventName(id, eventName) {
3811    var c = getCacheForID(id);
3812    return c[eventName] = c[eventName] || [];
3813  }
3814
3815  function createWrapper(element, eventName, handler) {
3816    var id = getEventID(element);
3817    var c = getWrappersForEventName(id, eventName);
3818    if (c.pluck("handler").include(handler)) return false;
3819
3820    var wrapper = function(event) {
3821      if (!Event || !Event.extend ||
3822        (event.eventName && event.eventName != eventName))
3823          return false;
3824
3825      Event.extend(event);
3826      handler.call(element, event);
3827    };
3828
3829    wrapper.handler = handler;
3830    c.push(wrapper);
3831    return wrapper;
3832  }
3833
3834  function findWrapper(id, eventName, handler) {
3835    var c = getWrappersForEventName(id, eventName);
3836    return c.find(function(wrapper) { return wrapper.handler == handler });
3837  }
3838
3839  function destroyWrapper(id, eventName, handler) {
3840    var c = getCacheForID(id);
3841    if (!c[eventName]) return false;
3842    c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
3843  }
3844
3845  function destroyCache() {
3846    for (var id in cache)
3847      for (var eventName in cache[id])
3848        cache[id][eventName] = null;
3849  }
3850
3851  if (window.attachEvent) {
3852    window.attachEvent("onunload", destroyCache);
3853  }
3854
3855  return {
3856    observe: function(element, eventName, handler) {
3857      element = $(element);
3858      var name = getDOMEventName(eventName);
3859
3860      var wrapper = createWrapper(element, eventName, handler);
3861      if (!wrapper) return element;
3862
3863      if (element.addEventListener) {
3864        element.addEventListener(name, wrapper, false);
3865      } else {
3866        element.attachEvent("on" + name, wrapper);
3867      }
3868
3869      return element;
3870    },
3871
3872    stopObserving: function(element, eventName, handler) {
3873      element = $(element);
3874      var id = getEventID(element), name = getDOMEventName(eventName);
3875
3876      if (!handler && eventName) {
3877        getWrappersForEventName(id, eventName).each(function(wrapper) {
3878          element.stopObserving(eventName, wrapper.handler);
3879        });
3880        return element;
3881
3882      } else if (!eventName) {
3883        Object.keys(getCacheForID(id)).each(function(eventName) {
3884          element.stopObserving(eventName);
3885        });
3886        return element;
3887      }
3888

3889      var wrapper = findWrapper(id, eventName, handler);
3890      if (!wrapper) return element;
3891
3892      if (element.removeEventListener) {
3893        element.removeEventListener(name, wrapper, false);
3894      } else {
3895        element.detachEvent("on" + name, wrapper);
3896      }
3897
3898      destroyWrapper(id, eventName, handler);
3899
3900      return element;
3901    },
3902
3903    fire: function(element, eventName, memo) {
3904      element = $(element);
3905      if (element == document && document.createEvent && !element.dispatchEvent)
3906        element = document.documentElement;
3907
3908      var event;
3909      if (document.createEvent) {
3910        event = document.createEvent("HTMLEvents");
3911        event.initEvent("dataavailable", true, true);
3912      } else {
3913        event = document.createEventObject();
3914        event.eventType = "ondataavailable";
3915      }
3916
3917      event.eventName = eventName;
3918      event.memo = memo || { };
3919
3920      if (document.createEvent) {
3921        element.dispatchEvent(event);
3922      } else {
3923        element.fireEvent(event.eventType, event);
3924      }
3925
3926      return Event.extend(event);
3927    }
3928  };
3929})());
3930
3931Object.extend(Event, Event.Methods);
3932
3933Element.addMethods({
3934  fire:          Event.fire,
3935  observe:       Event.observe,
3936  stopObserving: Event.stopObserving
3937});
3938
3939Object.extend(document, {
3940  fire:          Element.Methods.fire.methodize(),
3941  observe:       Element.Methods.observe.methodize(),
3942  stopObserving: Element.Methods.stopObserving.methodize(),
3943  loaded:        false
3944});
3945
3946(function() {
3947  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
3948     Matthias Miller, Dean Edwards and John Resig. */
3949
3950  var timer;
3951
3952  function fireContentLoadedEvent() {
3953    if (document.loaded) return;
3954    if (timer) window.clearInterval(timer);
3955    document.fire("dom:loaded");
3956    document.loaded = true;
3957  }
3958
3959  if (document.addEventListener) {
3960    if (Prototype.Browser.WebKit) {
3961      timer = window.setInterval(function() {
3962        if (/loaded|complete/.test(document.readyState))
3963          fireContentLoadedEvent();
3964      }, 0);
3965
3966      Event.observe(window, "load", fireContentLoadedEvent);
3967
3968    } else {
3969      document.addEventListener("DOMContentLoaded",
3970        fireContentLoadedEvent, false);
3971    }
3972
3973  } else {
3974    document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
3975    $("__onDOMContentLoaded").onreadystatechange = function() {
3976      if (this.readyState == "complete") {
3977        this.onreadystatechange = null;
3978        fireContentLoadedEvent();
3979      }
3980    };
3981  }
3982})();
3983/*------------------------------- DEPRECATED -------------------------------*/
3984
3985Hash.toQueryString = Object.toQueryString;
3986
3987var Toggle = { display: Element.toggle };
3988
3989Element.Methods.childOf = Element.Methods.descendantOf;
3990
3991var Insertion = {
3992  Before: function(element, content) {
3993    return Element.insert(element, {before:content});
3994  },
3995
3996  Top: function(element, content) {
3997    return Element.insert(element, {top:content});
3998  },
3999
4000  Bottom: function(element, content) {
4001    return Element.insert(element, {bottom:content});
4002  },
4003
4004  After: function(element, content) {
4005    return Element.insert(element, {after:content});
4006  }
4007};
4008
4009var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
4010
4011// This should be moved to script.aculo.us; notice the deprecated methods
4012// further below, that map to the newer Element methods.
4013var Position = {
4014  // set to true if needed, warning: firefox performance problems
4015  // NOT neeeded for page scrolling, only if draggable contained in
4016  // scrollable elements
4017  includeScrollOffsets: false,
4018
4019  // must be called before calling withinIncludingScrolloffset, every time the
4020  // page is scrolled
4021  prepare: function() {
4022    this.deltaX =  window.pageXOffset
4023                || document.documentElement.scrollLeft
4024                || document.body.scrollLeft
4025                || 0;
4026    this.deltaY =  window.pageYOffset
4027                || document.documentElement.scrollTop
4028                || document.body.scrollTop
4029                || 0;
4030  },
4031
4032  // caches x/y coordinate pair to use with overlap
4033  within: function(element, x, y) {
4034    if (this.includeScrollOffsets)
4035      return this.withinIncludingScrolloffsets(element, x, y);
4036    this.xcomp = x;
4037    this.ycomp = y;
4038    this.offset = Element.cumulativeOffset(element);
4039
4040    return (y >= this.offset[1] &&
4041            y <  this.offset[1] + element.offsetHeight &&
4042            x >= this.offset[0] &&
4043            x <  this.offset[0] + element.offsetWidth);
4044  },
4045
4046  withinIncludingScrolloffsets: function(element, x, y) {
4047    var offsetcache = Element.cumulativeScrollOffset(element);
4048
4049    this.xcomp = x + offsetcache[0] - this.deltaX;
4050    this.ycomp = y + offsetcache[1] - this.deltaY;
4051    this.offset = Element.cumulativeOffset(element);
4052
4053    return (this.ycomp >= this.offset[1] &&
4054            this.ycomp <  this.offset[1] + element.offsetHeight &&
4055            this.xcomp >= this.offset[0] &&
4056            this.xcomp <  this.offset[0] + element.offsetWidth);
4057  },
4058
4059  // within must be called directly before
4060  overlap: function(mode, element) {
4061    if (!mode) return 0;
4062    if (mode == 'vertical')
4063      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
4064        element.offsetHeight;
4065    if (mode == 'horizontal')
4066      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
4067        element.offsetWidth;
4068  },
4069
4070  // Deprecation layer -- use newer Element methods now (1.5.2).

4071
4072  cumulativeOffset: Element.Methods.cumulativeOffset,
4073
4074  positionedOffset: Element.Methods.positionedOffset,
4075
4076  absolutize: function(element) {
4077    Position.prepare();
4078    return Element.absolutize(element);
4079  },
4080
4081  relativize: function(element) {
4082    Position.prepare();
4083    return Element.relativize(element);
4084  },
4085
4086  realOffset: Element.Methods.cumulativeScrollOffset,
4087
4088  offsetParent: Element.Methods.getOffsetParent,
4089
4090  page: Element.Methods.viewportOffset,
4091
4092  clone: function(source, target, options) {
4093    options = options || { };
4094    return Element.clonePosition(target, source, options);
4095  }
4096};
4097
4098/*--------------------------------------------------------------------------*/
4099
4100if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
4101  function iter(name) {
4102    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
4103  }
4104
4105  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
4106  function(element, className) {
4107    className = className.toString().strip();
4108    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
4109    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
4110  } : function(element, className) {
4111    className = className.toString().strip();
4112    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
4113    if (!classNames && !className) return elements;
4114
4115    var nodes = $(element).getElementsByTagName('*');
4116    className = ' ' + className + ' ';
4117
4118    for (var i = 0, child, cn; child = nodes[i]; i++) {
4119      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
4120          (classNames && classNames.all(function(name) {
4121            return !name.toString().blank() && cn.include(' ' + name + ' ');
4122          }))))
4123        elements.push(Element.extend(child));
4124    }
4125    return elements;
4126  };
4127
4128  return function(className, parentElement) {
4129    return $(parentElement || document.body).getElementsByClassName(className);
4130  };
4131}(Element.Methods);
4132
4133/*--------------------------------------------------------------------------*/
4134
4135Element.ClassNames = Class.create();
4136Element.ClassNames.prototype = {
4137  initialize: function(element) {
4138    this.element = $(element);
4139  },
4140
4141  _each: function(iterator) {
4142    this.element.className.split(/\s+/).select(function(name) {
4143      return name.length > 0;
4144    })._each(iterator);
4145  },
4146
4147  set: function(className) {
4148    this.element.className = className;
4149  },
4150
4151  add: function(classNameToAdd) {
4152    if (this.include(classNameToAdd)) return;
4153    this.set($A(this).concat(classNameToAdd).join(' '));
4154  },
4155
4156  remove: function(classNameToRemove) {
4157    if (!this.include(classNameToRemove)) return;
4158    this.set($A(this).without(classNameToRemove).join(' '));
4159  },
4160
4161  toString: function() {
4162    return $A(this).join(' ');
4163  }
4164};
4165
4166Object.extend(Element.ClassNames.prototype, Enumerable);
4167
4168/*--------------------------------------------------------------------------*/
4169
4170Element.addMethods();

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