1/*  Prototype JavaScript framework, version 1.5.0
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://prototype.conio.net/
6 *
7/*--------------------------------------------------------------------------*/
8
9var Prototype = {
10  Version: '1.5.0',
11  BrowserFeatures: {
12    XPath: !!document.evaluate
13  },
14
15  ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',
16  emptyFunction: function() {},
17  K: function(x) { return x }
18}
19
20var Class = {
21  create: function() {
22    return function() {
23      this.initialize.apply(this, arguments);
24    }
25  }
26}
27
28var Abstract = new Object();
29
30Object.extend = function(destination, source) {
31  for (var property in source) {
32    destination[property] = source[property];
33  }
34  return destination;
35}
36
37Object.extend(Object, {
38  inspect: function(object) {
39    try {
40      if (object === undefined) return 'undefined';
41      if (object === null) return 'null';
42      return object.inspect ? object.inspect() : object.toString();
43    } catch (e) {
44      if (e instanceof RangeError) return '...';
45      throw e;
46    }
47  },
48
49  keys: function(object) {
50    var keys = [];
51    for (var property in object)
52      keys.push(property);
53    return keys;
54  },
55
56  values: function(object) {
57    var values = [];
58    for (var property in object)
59      values.push(object[property]);
60    return values;
61  },
62
63  clone: function(object) {
64    return Object.extend({}, object);
65  }
66});
67
68Function.prototype.bind = function() {
69  var __method = this, args = $A(arguments), object = args.shift();
70  return function() {
71    return __method.apply(object, args.concat($A(arguments)));
72  }
73}
74
75Function.prototype.bindAsEventListener = function(object) {
76  var __method = this, args = $A(arguments), object = args.shift();
77  return function(event) {
78    return __method.apply(object, [( event || window.event)].concat(args).concat($A(arguments)));
79  }
80}
81
82Object.extend(Number.prototype, {
83  toColorPart: function() {
84    var digits = this.toString(16);
85    if (this < 16) return '0' + digits;
86    return digits;
87  },
88
89  succ: function() {
90    return this + 1;
91  },
92
93  times: function(iterator) {
94    $R(0, this, true).each(iterator);
95    return this;
96  }
97});
98
99var Try = {
100  these: function() {
101    var returnValue;
102
103    for (var i = 0, length = arguments.length; i < length; i++) {
104      var lambda = arguments[i];
105      try {
106        returnValue = lambda();
107        break;
108      } catch (e) {}
109    }
110
111    return returnValue;
112  }
113}
114
115/*--------------------------------------------------------------------------*/
116
117var PeriodicalExecuter = Class.create();
118PeriodicalExecuter.prototype = {
119  initialize: function(callback, frequency) {
120    this.callback = callback;
121    this.frequency = frequency;
122    this.currentlyExecuting = false;
123
124    this.registerCallback();
125  },
126
127  registerCallback: function() {
128    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
129  },
130
131  stop: function() {
132    if (!this.timer) return;
133    clearInterval(this.timer);
134    this.timer = null;
135  },
136
137  onTimerEvent: function() {
138    if (!this.currentlyExecuting) {
139      try {
140        this.currentlyExecuting = true;
141        this.callback(this);
142      } finally {
143        this.currentlyExecuting = false;
144      }
145    }
146  }
147}
148String.interpret = function(value){
149  return value == null ? '' : String(value);
150}
151
152Object.extend(String.prototype, {
153  gsub: function(pattern, replacement) {
154    var result = '', source = this, match;
155    replacement = arguments.callee.prepareReplacement(replacement);
156
157    while (source.length > 0) {
158      if (match = source.match(pattern)) {
159        result += source.slice(0, match.index);
160        result += String.interpret(replacement(match));
161        source  = source.slice(match.index + match[0].length);
162      } else {
163        result += source, source = '';
164      }
165    }
166    return result;
167  },
168
169  sub: function(pattern, replacement, count) {
170    replacement = this.gsub.prepareReplacement(replacement);
171    count = count === undefined ? 1 : count;
172
173    return this.gsub(pattern, function(match) {
174      if (--count < 0) return match[0];
175      return replacement(match);
176    });
177  },
178
179  scan: function(pattern, iterator) {
180    this.gsub(pattern, iterator);
181    return this;
182  },
183
184  truncate: function(length, truncation) {
185    length = length || 30;
186    truncation = truncation === undefined ? '...' : truncation;
187    return this.length > length ?
188      this.slice(0, length - truncation.length) + truncation : this;
189  },
190
191  strip: function() {
192    return this.replace(/^\s+/, '').replace(/\s+$/, '');
193  },
194
195  stripTags: function() {
196    return this.replace(/<\/?[^>]+>/gi, '');
197  },
198
199  stripScripts: function() {
200    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
201  },
202
203  extractScripts: function() {
204    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
205    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
206    return (this.match(matchAll) || []).map(function(scriptTag) {
207      return (scriptTag.match(matchOne) || ['', ''])[1];
208    });
209  },
210
211  evalScripts: function() {
212    return this.extractScripts().map(function(script) { return eval(script) });
213  },
214
215  escapeHTML: function() {
216    var div = document.createElement('div');
217    var text = document.createTextNode(this);
218    div.appendChild(text);
219    return div.innerHTML;
220  },
221
222  unescapeHTML: function() {
223    var div = document.createElement('div');
224    div.innerHTML = this.stripTags();
225    return div.childNodes[0] ? (div.childNodes.length > 1 ?
226      $A(div.childNodes).inject('',function(memo,node){ return memo+node.nodeValue }) :
227      div.childNodes[0].nodeValue) : '';
228  },
229
230  toQueryParams: function(separator) {
231    var match = this.strip().match(/([^?#]*)(#.*)?$/);
232    if (!match) return {};
233
234    return match[1].split(separator || '&').inject({}, function(hash, pair) {
235      if ((pair = pair.split('='))[0]) {
236        var name = decodeURIComponent(pair[0]);
237        var value = pair[1] ? decodeURIComponent(pair[1]) : undefined;
238
239        if (hash[name] !== undefined) {
240          if (hash[name].constructor != Array)
241            hash[name] = [hash[name]];
242          if (value) hash[name].push(value);
243        }
244        else hash[name] = value;
245      }
246      return hash;
247    });
248  },
249
250  toArray: function() {
251    return this.split('');
252  },
253
254  succ: function() {
255    return this.slice(0, this.length - 1) +
256      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
257  },
258
259  camelize: function() {
260    var parts = this.split('-'), len = parts.length;
261    if (len == 1) return parts[0];
262
263    var camelized = this.charAt(0) == '-'
264      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
265      : parts[0];
266
267    for (var i = 1; i < len; i++)
268      camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
269
270    return camelized;
271  },
272
273  capitalize: function(){
274    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
275  },
276
277  underscore: function() {
278    return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
279  },
280
281  dasherize: function() {
282    return this.gsub(/_/,'-');
283  },
284
285  inspect: function(useDoubleQuotes) {
286    var escapedString = this.replace(/\\/g, '\\\\');
287    if (useDoubleQuotes)
288      return '"' + escapedString.replace(/"/g, '\\"') + '"';
289    else
290      return "'" + escapedString.replace(/'/g, '\\\'') + "'";
291  }
292});
293
294String.prototype.gsub.prepareReplacement = function(replacement) {
295  if (typeof replacement == 'function') return replacement;
296  var template = new Template(replacement);
297  return function(match) { return template.evaluate(match) };
298}
299
300String.prototype.parseQuery = String.prototype.toQueryParams;
301
302var Template = Class.create();
303Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
304Template.prototype = {
305  initialize: function(template, pattern) {
306    this.template = template.toString();
307    this.pattern  = pattern || Template.Pattern;
308  },
309
310  evaluate: function(object) {
311    return this.template.gsub(this.pattern, function(match) {
312      var before = match[1];
313      if (before == '\\') return match[2];
314      return before + String.interpret(object[match[3]]);
315    });
316  }
317}
318
319var $break    = new Object();
320var $continue = new Object();
321
322var Enumerable = {
323  each: function(iterator) {
324    var index = 0;
325    try {
326      this._each(function(value) {
327        try {
328          iterator(value, index++);
329        } catch (e) {
330          if (e != $continue) throw e;
331        }
332      });
333    } catch (e) {
334      if (e != $break) throw e;
335    }
336    return this;
337  },
338
339  eachSlice: function(number, iterator) {
340    var index = -number, slices = [], array = this.toArray();
341    while ((index += number) < array.length)
342      slices.push(array.slice(index, index+number));
343    return slices.map(iterator);
344  },
345
346  all: function(iterator) {
347    var result = true;
348    this.each(function(value, index) {
349      result = result && !!(iterator || Prototype.K)(value, index);
350      if (!result) throw $break;
351    });
352    return result;
353  },
354
355  any: function(iterator) {
356    var result = false;
357    this.each(function(value, index) {
358      if (result = !!(iterator || Prototype.K)(value, index))
359        throw $break;
360    });
361    return result;
362  },
363
364  collect: function(iterator) {
365    var results = [];
366    this.each(function(value, index) {
367      results.push((iterator || Prototype.K)(value, index));
368    });
369    return results;
370  },
371
372  detect: function(iterator) {
373    var result;
374    this.each(function(value, index) {
375      if (iterator(value, index)) {
376        result = value;
377        throw $break;
378      }
379    });
380    return result;
381  },
382
383  findAll: function(iterator) {
384    var results = [];
385    this.each(function(value, index) {
386      if (iterator(value, index))
387        results.push(value);
388    });
389    return results;
390  },
391
392  grep: function(pattern, iterator) {
393    var results = [];
394    this.each(function(value, index) {
395      var stringValue = value.toString();
396      if (stringValue.match(pattern))
397        results.push((iterator || Prototype.K)(value, index));
398    })
399    return results;
400  },
401
402  include: function(object) {
403    var found = false;
404    this.each(function(value) {
405      if (value == object) {
406        found = true;
407        throw $break;
408      }
409    });
410    return found;
411  },
412
413  inGroupsOf: function(number, fillWith) {
414    fillWith = fillWith === undefined ? null : fillWith;
415    return this.eachSlice(number, function(slice) {
416      while(slice.length < number) slice.push(fillWith);
417      return slice;
418    });
419  },
420
421  inject: function(memo, iterator) {
422    this.each(function(value, index) {
423      memo = iterator(memo, value, index);
424    });
425    return memo;
426  },
427
428  invoke: function(method) {
429    var args = $A(arguments).slice(1);
430    return this.map(function(value) {
431      return value[method].apply(value, args);
432    });
433  },
434
435  max: function(iterator) {
436    var result;
437    this.each(function(value, index) {
438      value = (iterator || Prototype.K)(value, index);
439      if (result == undefined || value >= result)
440        result = value;
441    });
442    return result;
443  },
444
445  min: function(iterator) {
446    var result;
447    this.each(function(value, index) {
448      value = (iterator || Prototype.K)(value, index);
449      if (result == undefined || value < result)
450        result = value;
451    });
452    return result;
453  },
454
455  partition: function(iterator) {
456    var trues = [], falses = [];
457    this.each(function(value, index) {
458      ((iterator || Prototype.K)(value, index) ?
459        trues : falses).push(value);
460    });
461    return [trues, falses];
462  },
463
464  pluck: function(property) {
465    var results = [];
466    this.each(function(value, index) {
467      results.push(value[property]);
468    });
469    return results;
470  },
471
472  reject: function(iterator) {
473    var results = [];
474    this.each(function(value, index) {
475      if (!iterator(value, index))
476        results.push(value);
477    });
478    return results;
479  },
480
481  sortBy: function(iterator) {
482    return this.map(function(value, index) {
483      return {value: value, criteria: iterator(value, index)};
484    }).sort(function(left, right) {
485      var a = left.criteria, b = right.criteria;
486      return a < b ? -1 : a > b ? 1 : 0;
487    }).pluck('value');
488  },
489
490  toArray: function() {
491    return this.map();
492  },
493
494  zip: function() {
495    var iterator = Prototype.K, args = $A(arguments);
496    if (typeof args.last() == 'function')
497      iterator = args.pop();
498
499    var collections = [this].concat(args).map($A);
500    return this.map(function(value, index) {
501      return iterator(collections.pluck(index));
502    });
503  },
504
505  size: function() {
506    return this.toArray().length;
507  },
508
509  inspect: function() {
510    return '#<Enumerable:' + this.toArray().inspect() + '>';
511  }
512}
513
514Object.extend(Enumerable, {
515  map:     Enumerable.collect,
516  find:    Enumerable.detect,
517  select:  Enumerable.findAll,
518  member:  Enumerable.include,
519  entries: Enumerable.toArray
520});
521var $A = Array.from = function(iterable) {
522  if (!iterable) return [];
523  if (iterable.toArray) {
524    return iterable.toArray();
525  } else {
526    var results = [];
527    for (var i = 0, length = iterable.length; i < length; i++)
528      results.push(iterable[i]);
529    return results;
530  }
531}
532
533Object.extend(Array.prototype, Enumerable);
534
535if (!Array.prototype._reverse)
536  Array.prototype._reverse = Array.prototype.reverse;
537
538Object.extend(Array.prototype, {
539  _each: function(iterator) {
540    for (var i = 0, length = this.length; i < length; i++)
541      iterator(this[i]);
542  },
543
544  clear: function() {
545    this.length = 0;
546    return this;
547  },
548
549  first: function() {
550    return this[0];
551  },
552
553  last: function() {
554    return this[this.length - 1];
555  },
556
557  compact: function() {
558    return this.select(function(value) {
559      return value != null;
560    });
561  },
562
563  flatten: function() {
564    return this.inject([], function(array, value) {
565      return array.concat(value && value.constructor == Array ?
566        value.flatten() : [value]);
567    });
568  },
569
570  without: function() {
571    var values = $A(arguments);
572    return this.select(function(value) {
573      return !values.include(value);
574    });
575  },
576
577  indexOf: function(object) {
578    for (var i = 0, length = this.length; i < length; i++)
579      if (this[i] == object) return i;
580    return -1;
581  },
582
583  reverse: function(inline) {
584    return (inline !== false ? this : this.toArray())._reverse();
585  },
586
587  reduce: function() {
588    return this.length > 1 ? this : this[0];
589  },
590
591  uniq: function() {
592    return this.inject([], function(array, value) {
593      return array.include(value) ? array : array.concat([value]);
594    });
595  },
596
597  clone: function() {
598    return [].concat(this);
599  },
600
601  size: function() {
602    return this.length;
603  },
604
605  inspect: function() {
606    return '[' + this.map(Object.inspect).join(', ') + ']';
607  }
608});
609
610Array.prototype.toArray = Array.prototype.clone;
611
612function $w(string){
613  string = string.strip();
614  return string ? string.split(/\s+/) : [];
615}
616
617if(window.opera){
618  Array.prototype.concat = function(){
619    var array = [];
620    for(var i = 0, length = this.length; i < length; i++) array.push(this[i]);
621    for(var i = 0, length = arguments.length; i < length; i++) {
622      if(arguments[i].constructor == Array) {
623        for(var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
624          array.push(arguments[i][j]);
625      } else {
626        array.push(arguments[i]);
627      }
628    }
629    return array;
630  }
631}
632var PHash = function(obj) {
633  Object.extend(this, obj || {});
634};
635
636Object.extend(PHash, {
637  toQueryString: function(obj) {
638    var parts = [];
639
640	  this.prototype._each.call(obj, function(pair) {
641      if (!pair.key) return;
642
643      if (pair.value && pair.value.constructor == Array) {
644        var values = pair.value.compact();
645        if (values.length < 2) pair.value = values.reduce();
646        else {
647        	key = encodeURIComponent(pair.key);
648          values.each(function(value) {
649            value = value != undefined ? encodeURIComponent(value) : '';
650            parts.push(key + '=' + encodeURIComponent(value));
651          });
652          return;
653        }
654      }
655      if (pair.value == undefined) pair[1] = '';
656      parts.push(pair.map(encodeURIComponent).join('='));
657	  });
658
659    return parts.join('&');
660  }
661});
662
663Object.extend(PHash.prototype, Enumerable);
664Object.extend(PHash.prototype, {
665  _each: function(iterator) {
666    for (var key in this) {
667      var value = this[key];
668      if (value && value == PHash.prototype[key]) continue;
669
670      var pair = [key, value];
671      pair.key = key;
672      pair.value = value;
673      iterator(pair);
674    }
675  },
676
677  keys: function() {
678    return this.pluck('key');
679  },
680
681  values: function() {
682    return this.pluck('value');
683  },
684
685  merge: function(hash) {
686    return $H(hash).inject(this, function(mergedHash, pair) {
687      mergedHash[pair.key] = pair.value;
688      return mergedHash;
689    });
690  },
691
692  remove: function() {
693    var result;
694    for(var i = 0, length = arguments.length; i < length; i++) {
695      var value = this[arguments[i]];
696      if (value !== undefined){
697        if (result === undefined) result = value;
698        else {
699          if (result.constructor != Array) result = [result];
700          result.push(value)
701        }
702      }
703      delete this[arguments[i]];
704    }
705    return result;
706  },
707
708  toQueryString: function() {
709    return PHash.toQueryString(this);
710  },
711
712  inspect: function() {
713    return '#<PHash:{' + this.map(function(pair) {
714      return pair.map(Object.inspect).join(': ');
715    }).join(', ') + '}>';
716  }
717});
718
719function $H(object) {
720  if (object && object.constructor == PHash) return object;
721  return new PHash(object);
722};
723ObjectRange = Class.create();
724Object.extend(ObjectRange.prototype, Enumerable);
725Object.extend(ObjectRange.prototype, {
726  initialize: function(start, end, exclusive) {
727    this.start = start;
728    this.end = end;
729    this.exclusive = exclusive;
730  },
731
732  _each: function(iterator) {
733    var value = this.start;
734    while (this.include(value)) {
735      iterator(value);
736      value = value.succ();
737    }
738  },
739
740  include: function(value) {
741    if (value < this.start)
742      return false;
743    if (this.exclusive)
744      return value < this.end;
745    return value <= this.end;
746  }
747});
748
749var $R = function(start, end, exclusive) {
750  return new ObjectRange(start, end, exclusive);
751}
752
753var Ajax = {
754  getTransport: function() {
755    return Try.these(
756      function() {return new XMLHttpRequest()},
757      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
758      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
759    ) || false;
760  },
761
762  activeRequestCount: 0
763}
764
765Ajax.Responders = {
766  responders: [],
767
768  _each: function(iterator) {
769    this.responders._each(iterator);
770  },
771
772  register: function(responder) {
773    if (!this.include(responder))
774      this.responders.push(responder);
775  },
776
777  unregister: function(responder) {
778    this.responders = this.responders.without(responder);
779  },
780
781  dispatch: function(callback, request, transport, json) {
782    this.each(function(responder) {
783      if (typeof responder[callback] == 'function') {
784        try {
785          responder[callback].apply(responder, [request, transport, json]);
786        } catch (e) {}
787      }
788    });
789  }
790};
791
792Object.extend(Ajax.Responders, Enumerable);
793
794Ajax.Responders.register({
795  onCreate: function() {
796    Ajax.activeRequestCount++;
797  },
798  onComplete: function() {
799    Ajax.activeRequestCount--;
800  }
801});
802
803Ajax.Base = function() {};
804Ajax.Base.prototype = {
805  setOptions: function(options) {
806    this.options = {
807      method:       'post',
808      asynchronous: true,
809      contentType:  'application/x-www-form-urlencoded',
810      encoding:     'UTF-8',
811      parameters:   ''
812    }
813    Object.extend(this.options, options || {});
814
815    this.options.method = this.options.method.toLowerCase();
816    if (typeof this.options.parameters == 'string')
817      this.options.parameters = this.options.parameters.toQueryParams();
818  }
819}
820
821Ajax.Request = Class.create();
822Ajax.Request.Events =
823  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
824
825Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
826  _complete: false,
827
828  initialize: function(url, options) {
829    this.transport = Ajax.getTransport();
830    this.setOptions(options);
831    this.request(url);
832  },
833
834  request: function(url) {
835    this.url = url;
836    this.method = this.options.method;
837    var params = this.options.parameters;
838
839    if (!['get', 'post'].include(this.method)) {
840      // simulate other verbs over post
841      params['_method'] = this.method;
842      this.method = 'post';
843    }
844
845    params = PHash.toQueryString(params);
846    if (params && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) params += '&_='
847
848    // when GET, append parameters to URL
849    if (this.method == 'get' && params)
850      this.url += (this.url.indexOf('?') > -1 ? '&' : '?') + params;
851
852    try {
853      Ajax.Responders.dispatch('onCreate', this, this.transport);
854
855      this.transport.open(this.method.toUpperCase(), this.url,
856        this.options.asynchronous);
857
858      if (this.options.asynchronous)
859        setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);
860
861      this.transport.onreadystatechange = this.onStateChange.bind(this);
862      this.setRequestHeaders();
863
864      var body = this.method == 'post' ? (this.options.postBody || params) : null;
865
866      this.transport.send(body);
867
868      /* Force Firefox to handle ready state 4 for synchronous requests */
869      if (!this.options.asynchronous && this.transport.overrideMimeType)
870        this.onStateChange();
871
872    }
873    catch (e) {
874      this.dispatchException(e);
875    }
876  },
877
878  onStateChange: function() {
879    var readyState = this.transport.readyState;
880    if (readyState > 1 && !((readyState == 4) && this._complete))
881      this.respondToReadyState(this.transport.readyState);
882  },
883
884  setRequestHeaders: function() {
885    var headers = {
886      'X-Requested-With': 'XMLHttpRequest',
887      'X-Prototype-Version': Prototype.Version,
888      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
889    };
890
891    if (this.method == 'post') {
892      headers['Content-type'] = this.options.contentType +
893        (this.options.encoding ? '; charset=' + this.options.encoding : '');
894
895      /* Force "Connection: close" for older Mozilla browsers to work
896       * around a bug where XMLHttpRequest sends an incorrect
897       * Content-length header. See Mozilla Bugzilla #246651.
898       */
899      if (this.transport.overrideMimeType &&
900          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
901            headers['Connection'] = 'close';
902    }
903
904    // user-defined headers
905    if (typeof this.options.requestHeaders == 'object') {
906      var extras = this.options.requestHeaders;
907
908      if (typeof extras.push == 'function')
909        for (var i = 0, length = extras.length; i < length; i += 2)
910          headers[extras[i]] = extras[i+1];
911      else
912        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
913    }
914
915    for (var name in headers)
916      this.transport.setRequestHeader(name, headers[name]);
917  },
918
919  success: function() {
920    return !this.transport.status
921        || (this.transport.status >= 200 && this.transport.status < 300);
922  },
923
924  respondToReadyState: function(readyState) {
925    var state = Ajax.Request.Events[readyState];
926    var transport = this.transport, json = this.evalJSON();
927
928    if (state == 'Complete') {
929      try {
930        this._complete = true;
931        (this.options['on' + this.transport.status]
932         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
933         || Prototype.emptyFunction)(transport, json);
934      } catch (e) {
935        this.dispatchException(e);
936      }
937
938      if ((this.getHeader('Content-type') || 'text/javascript').strip().
939        match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
940          this.evalResponse();
941    }
942
943    try {
944      (this.options['on' + state] || Prototype.emptyFunction)(transport, json);
945      Ajax.Responders.dispatch('on' + state, this, transport, json);
946    } catch (e) {
947      this.dispatchException(e);
948    }
949
950    if (state == 'Complete') {
951      // avoid memory leak in MSIE: clean up
952      this.transport.onreadystatechange = Prototype.emptyFunction;
953    }
954  },
955
956  getHeader: function(name) {
957    try {
958      return this.transport.getResponseHeader(name);
959    } catch (e) { return null }
960  },
961
962  evalJSON: function() {
963    try {
964      var json = this.getHeader('X-JSON');
965      return json ? eval('(' + json + ')') : null;
966    } catch (e) { return null }
967  },
968
969  evalResponse: function() {
970    try {
971      return eval(this.transport.responseText);
972    } catch (e) {
973      this.dispatchException(e);
974    }
975  },
976
977  dispatchException: function(exception) {
978    (this.options.onException || Prototype.emptyFunction)(this, exception);
979    Ajax.Responders.dispatch('onException', this, exception);
980  }
981});
982
983Ajax.Updater = Class.create();
984
985Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
986  initialize: function(container, url, options) {
987    this.container = {
988      success: (container.success || container),
989      failure: (container.failure || (container.success ? null : container))
990    }
991
992    this.transport = Ajax.getTransport();
993    this.setOptions(options);
994
995    var onComplete = this.options.onComplete || Prototype.emptyFunction;
996    this.options.onComplete = (function(transport, param) {
997      this.updateContent();
998      onComplete(transport, param);
999    }).bind(this);
1000
1001    this.request(url);
1002  },
1003
1004  updateContent: function() {
1005    var receiver = this.container[this.success() ? 'success' : 'failure'];
1006    var response = this.transport.responseText;
1007
1008    if (!this.options.evalScripts) response = response.stripScripts();
1009
1010    if (receiver = $(receiver)) {
1011      if (this.options.insertion)
1012        new this.options.insertion(receiver, response);
1013      else
1014        receiver.update(response);
1015    }
1016
1017    if (this.success()) {
1018      if (this.onComplete)
1019        setTimeout(this.onComplete.bind(this), 10);
1020    }
1021  }
1022});
1023
1024Ajax.PeriodicalUpdater = Class.create();
1025Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
1026  initialize: function(container, url, options) {
1027    this.setOptions(options);
1028    this.onComplete = this.options.onComplete;
1029
1030    this.frequency = (this.options.frequency || 2);
1031    this.decay = (this.options.decay || 1);
1032
1033    this.updater = {};
1034    this.container = container;
1035    this.url = url;
1036
1037    this.start();
1038  },
1039
1040  start: function() {
1041    this.options.onComplete = this.updateComplete.bind(this);
1042    this.onTimerEvent();
1043  },
1044
1045  stop: function() {
1046    this.updater.options.onComplete = undefined;
1047    clearTimeout(this.timer);
1048    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
1049  },
1050
1051  updateComplete: function(request) {
1052    if (this.options.decay) {
1053      this.decay = (request.responseText == this.lastText ?
1054        this.decay * this.options.decay : 1);
1055
1056      this.lastText = request.responseText;
1057    }
1058    this.timer = setTimeout(this.onTimerEvent.bind(this),
1059      this.decay * this.frequency * 1000);
1060  },
1061
1062  onTimerEvent: function() {
1063    this.updater = new Ajax.Updater(this.container, this.url, this.options);
1064  }
1065});
1066function $(element) {
1067  if (arguments.length > 1) {
1068    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
1069      elements.push($(arguments[i]));
1070    return elements;
1071  }
1072  if (typeof element == 'string')
1073    element = document.getElementById(element);
1074  return Element.extend(element);
1075}
1076
1077if (Prototype.BrowserFeatures.XPath) {
1078  document._getElementsByXPath = function(expression, parentElement) {
1079    var results = [];
1080    var query = document.evaluate(expression, $(parentElement) || document,
1081      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
1082    for (var i = 0, length = query.snapshotLength; i < length; i++)
1083      results.push(query.snapshotItem(i));
1084    return results;
1085  };
1086}
1087
1088document.getElementsByClassName = function(className, parentElement) {
1089  if (Prototype.BrowserFeatures.XPath) {
1090    var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
1091    return document._getElementsByXPath(q, parentElement);
1092  } else {
1093    var children = ($(parentElement) || document.body).getElementsByTagName('*');
1094    var elements = [], child;
1095    for (var i = 0, length = children.length; i < length; i++) {
1096      child = children[i];
1097      if (Element.hasClassName(child, className))
1098        elements.push(Element.extend(child));
1099    }
1100    return elements;
1101  }
1102};
1103
1104/*--------------------------------------------------------------------------*/
1105
1106if (!window.Element)
1107  var Element = new Object();
1108
1109Element.extend = function(element) {
1110  if (!element || _nativeExtensions || element.nodeType == 3) return element;
1111
1112  if (!element._extended && element.tagName && element != window) {
1113    var methods = Object.clone(Element.Methods), cache = Element.extend.cache;
1114
1115    if (element.tagName == 'FORM')
1116      Object.extend(methods, Form.Methods);
1117    if (['INPUT', 'TEXTAREA', 'SELECT'].include(element.tagName))
1118      Object.extend(methods, Form.Element.Methods);
1119
1120    Object.extend(methods, Element.Methods.Simulated);
1121
1122    for (var property in methods) {
1123      var value = methods[property];
1124      if (typeof value == 'function' && !(property in element))
1125        element[property] = cache.findOrStore(value);
1126    }
1127  }
1128
1129  element._extended = true;
1130  return element;
1131};
1132
1133Element.extend.cache = {
1134  findOrStore: function(value) {
1135    return this[value] = this[value] || function() {
1136      return value.apply(null, [this].concat($A(arguments)));
1137    }
1138  }
1139};
1140
1141Element.Methods = {
1142  visible: function(element) {
1143    return $(element).style.display != 'none';
1144  },
1145
1146  toggle: function(element) {
1147    element = $(element);
1148    Element[Element.visible(element) ? 'hide' : 'show'](element);
1149    return element;
1150  },
1151
1152  hide: function(element) {
1153    $(element).style.display = 'none';
1154    return element;
1155  },
1156
1157  show: function(element) {
1158    $(element).style.display = '';
1159    return element;
1160  },
1161
1162  remove: function(element) {
1163    element = $(element);
1164    element.parentNode.removeChild(element);
1165    return element;
1166  },
1167
1168  update: function(element, html) {
1169    html = typeof html == 'undefined' ? '' : html.toString();
1170    $(element).innerHTML = html.stripScripts();
1171    setTimeout(function() {html.evalScripts()}, 10);
1172    return element;
1173  },
1174
1175  replace: function(element, html) {
1176    element = $(element);
1177    html = typeof html == 'undefined' ? '' : html.toString();
1178    if (element.outerHTML) {
1179      element.outerHTML = html.stripScripts();
1180    } else {
1181      var range = element.ownerDocument.createRange();
1182      range.selectNodeContents(element);
1183      element.parentNode.replaceChild(
1184        range.createContextualFragment(html.stripScripts()), element);
1185    }
1186    setTimeout(function() {html.evalScripts()}, 10);
1187    return element;
1188  },
1189
1190  inspect: function(element) {
1191    element = $(element);
1192    var result = '<' + element.tagName.toLowerCase();
1193    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
1194      var property = pair.first(), attribute = pair.last();
1195      var value = (element[property] || '').toString();
1196      if (value) result += ' ' + attribute + '=' + value.inspect(true);
1197    });
1198    return result + '>';
1199  },
1200
1201  recursivelyCollect: function(element, property) {
1202    element = $(element);
1203    var elements = [];
1204    while (element = element[property])
1205      if (element.nodeType == 1)
1206        elements.push(Element.extend(element));
1207    return elements;
1208  },
1209
1210  ancestors: function(element) {
1211    return $(element).recursivelyCollect('parentNode');
1212  },
1213
1214  descendants: function(element) {
1215    return $A($(element).getElementsByTagName('*'));
1216  },
1217
1218  immediateDescendants: function(element) {
1219    if (!(element = $(element).firstChild)) return [];
1220    while (element && element.nodeType != 1) element = element.nextSibling;
1221    if (element) return [element].concat($(element).nextSiblings());
1222    return [];
1223  },
1224
1225  previousSiblings: function(element) {
1226    return $(element).recursivelyCollect('previousSibling');
1227  },
1228
1229  nextSiblings: function(element) {
1230    return $(element).recursivelyCollect('nextSibling');
1231  },
1232
1233  siblings: function(element) {
1234    element = $(element);
1235    return element.previousSiblings().reverse().concat(element.nextSiblings());
1236  },
1237
1238  match: function(element, selector) {
1239    if (typeof selector == 'string')
1240      selector = new Selector(selector);
1241    return selector.match($(element));
1242  },
1243
1244  up: function(element, expression, index) {
1245    return Selector.findElement($(element).ancestors(), expression, index);
1246  },
1247
1248  down: function(element, expression, index) {
1249    return Selector.findElement($(element).descendants(), expression, index);
1250  },
1251
1252  previous: function(element, expression, index) {
1253    return Selector.findElement($(element).previousSiblings(), expression, index);
1254  },
1255
1256  next: function(element, expression, index) {
1257    return Selector.findElement($(element).nextSiblings(), expression, index);
1258  },
1259
1260  getElementsBySelector: function() {
1261    var args = $A(arguments), element = $(args.shift());
1262    return Selector.findChildElements(element, args);
1263  },
1264
1265  getElementsByClassName: function(element, className) {
1266    return document.getElementsByClassName(className, element);
1267  },
1268
1269  readAttribute: function(element, name) {
1270    element = $(element);
1271    if (document.all && !window.opera) {
1272      var t = Element._attributeTranslations;
1273      if (t.values[name]) return t.values[name](element, name);
1274      if (t.names[name])  name = t.names[name];
1275      var attribute = element.attributes[name];
1276      if(attribute) return attribute.nodeValue;
1277    }
1278    return element.getAttribute(name);
1279  },
1280
1281  getHeight: function(element) {
1282    return $(element).getDimensions().height;
1283  },
1284
1285  getWidth: function(element) {
1286    return $(element).getDimensions().width;
1287  },
1288
1289  classNames: function(element) {
1290    return new Element.ClassNames(element);
1291  },
1292
1293  hasClassName: function(element, className) {
1294    if (!(element = $(element))) return;
1295    var elementClassName = element.className;
1296    if (elementClassName.length == 0) return false;
1297    if (elementClassName == className ||
1298        elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
1299      return true;
1300    return false;
1301  },
1302
1303  addClassName: function(element, className) {
1304    if (!(element = $(element))) return;
1305    Element.classNames(element).add(className);
1306    return element;
1307  },
1308
1309  removeClassName: function(element, className) {
1310    if (!(element = $(element))) return;
1311    Element.classNames(element).remove(className);
1312    return element;
1313  },
1314
1315  toggleClassName: function(element, className) {
1316    if (!(element = $(element))) return;
1317    Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);
1318    return element;
1319  },
1320
1321  observe: function() {
1322    Event.observe.apply(Event, arguments);
1323    return $A(arguments).first();
1324  },
1325
1326  stopObserving: function() {
1327    Event.stopObserving.apply(Event, arguments);
1328    return $A(arguments).first();
1329  },
1330
1331  // removes whitespace-only text node children
1332  cleanWhitespace: function(element) {
1333    element = $(element);
1334    var node = element.firstChild;
1335    while (node) {
1336      var nextNode = node.nextSibling;
1337      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
1338        element.removeChild(node);
1339      node = nextNode;
1340    }
1341    return element;
1342  },
1343
1344  empty: function(element) {
1345    return $(element).innerHTML.match(/^\s*$/);
1346  },
1347
1348  descendantOf: function(element, ancestor) {
1349    element = $(element), ancestor = $(ancestor);
1350    while (element = element.parentNode)
1351      if (element == ancestor) return true;
1352    return false;
1353  },
1354
1355  scrollTo: function(element) {
1356    element = $(element);
1357    var pos = Position.cumulativeOffset(element);
1358    window.scrollTo(pos[0], pos[1]);
1359    return element;
1360  },
1361
1362  getStyle: function(element, style) {
1363    element = $(element);
1364    if (['float','cssFloat'].include(style))
1365      style = (typeof element.style.styleFloat != 'undefined' ? 'styleFloat' : 'cssFloat');
1366    style = style.camelize();
1367    var value = element.style[style];
1368    if (!value) {
1369      if (document.defaultView && document.defaultView.getComputedStyle) {
1370        var css = document.defaultView.getComputedStyle(element, null);
1371        value = css ? css[style] : null;
1372      } else if (element.currentStyle) {
1373        value = element.currentStyle[style];
1374      }
1375    }
1376
1377    if((value == 'auto') && ['width','height'].include(style) && (element.getStyle('display') != 'none'))
1378      value = element['offset'+style.capitalize()] + 'px';
1379
1380    if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
1381      if (Element.getStyle(element, 'position') == 'static') value = 'auto';
1382    if(style == 'opacity') {
1383      if(value) return parseFloat(value);
1384      if(value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
1385        if(value[1]) return parseFloat(value[1]) / 100;
1386      return 1.0;
1387    }
1388    return value == 'auto' ? null : value;
1389  },
1390
1391  setStyle: function(element, style) {
1392    element = $(element);
1393    for (var name in style) {
1394      var value = style[name];
1395      if(name == 'opacity') {
1396        if (value == 1) {
1397          value = (/Gecko/.test(navigator.userAgent) &&
1398            !/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0;
1399          if(/MSIE/.test(navigator.userAgent) && !window.opera)
1400            element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
1401        } else if(value === '') {
1402          if(/MSIE/.test(navigator.userAgent) && !window.opera)
1403            element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
1404        } else {
1405          if(value < 0.00001) value = 0;
1406          if(/MSIE/.test(navigator.userAgent) && !window.opera)
1407            element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'') +
1408              'alpha(opacity='+value*100+')';
1409        }
1410      } else if(['float','cssFloat'].include(name)) name = (typeof element.style.styleFloat != 'undefined') ? 'styleFloat' : 'cssFloat';
1411      element.style[name.camelize()] = value;
1412    }
1413    return element;
1414  },
1415
1416  getDimensions: function(element) {
1417    element = $(element);
1418    var display = $(element).getStyle('display');
1419    if (display != 'none' && display != null) // Safari bug
1420      return {width: element.offsetWidth, height: element.offsetHeight};
1421
1422    // All *Width and *Height properties give 0 on elements with display none,
1423    // so enable the element temporarily
1424    var els = element.style;
1425    var originalVisibility = els.visibility;
1426    var originalPosition = els.position;
1427    var originalDisplay = els.display;
1428    els.visibility = 'hidden';
1429    els.position = 'absolute';
1430    els.display = 'block';
1431    var originalWidth = element.clientWidth;
1432    var originalHeight = element.clientHeight;
1433    els.display = originalDisplay;
1434    els.position = originalPosition;
1435    els.visibility = originalVisibility;
1436    return {width: originalWidth, height: originalHeight};
1437  },
1438
1439  makePositioned: function(element) {
1440    element = $(element);
1441    var pos = Element.getStyle(element, 'position');
1442    if (pos == 'static' || !pos) {
1443      element._madePositioned = true;
1444      element.style.position = 'relative';
1445      // Opera returns the offset relative to the positioning context, when an
1446      // element is position relative but top and left have not been defined
1447      if (window.opera) {
1448        element.style.top = 0;
1449        element.style.left = 0;
1450      }
1451    }
1452    return element;
1453  },
1454
1455  undoPositioned: function(element) {
1456    element = $(element);
1457    if (element._madePositioned) {
1458      element._madePositioned = undefined;
1459      element.style.position =
1460        element.style.top =
1461        element.style.left =
1462        element.style.bottom =
1463        element.style.right = '';
1464    }
1465    return element;
1466  },
1467
1468  makeClipping: function(element) {
1469    element = $(element);
1470    if (element._overflow) return element;
1471    element._overflow = element.style.overflow || 'auto';
1472    if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
1473      element.style.overflow = 'hidden';
1474    return element;
1475  },
1476
1477  undoClipping: function(element) {
1478    element = $(element);
1479    if (!element._overflow) return element;
1480    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
1481    element._overflow = null;
1482    return element;
1483  }
1484};
1485
1486Object.extend(Element.Methods, {childOf: Element.Methods.descendantOf});
1487
1488Element._attributeTranslations = {};
1489
1490Element._attributeTranslations.names = {
1491  colspan:   "colSpan",
1492  rowspan:   "rowSpan",
1493  valign:    "vAlign",
1494  datetime:  "dateTime",
1495  accesskey: "accessKey",
1496  tabindex:  "tabIndex",
1497  enctype:   "encType",
1498  maxlength: "maxLength",
1499  readonly:  "readOnly",
1500  longdesc:  "longDesc"
1501};
1502
1503Element._attributeTranslations.values = {
1504  _getAttr: function(element, attribute) {
1505    return element.getAttribute(attribute, 2);
1506  },
1507
1508  _flag: function(element, attribute) {
1509    return $(element).hasAttribute(attribute) ? attribute : null;
1510  },
1511
1512  style: function(element) {
1513    return element.style.cssText.toLowerCase();
1514  },
1515
1516  title: function(element) {
1517    var node = element.getAttributeNode('title');
1518    return node.specified ? node.nodeValue : null;
1519  }
1520};
1521
1522Object.extend(Element._attributeTranslations.values, {
1523  href: Element._attributeTranslations.values._getAttr,
1524  src:  Element._attributeTranslations.values._getAttr,
1525  disabled: Element._attributeTranslations.values._flag,
1526  checked:  Element._attributeTranslations.values._flag,
1527  readonly: Element._attributeTranslations.values._flag,
1528  multiple: Element._attributeTranslations.values._flag
1529});
1530
1531Element.Methods.Simulated = {
1532  hasAttribute: function(element, attribute) {
1533    var t = Element._attributeTranslations;
1534    attribute = t.names[attribute] || attribute;
1535    return $(element).getAttributeNode(attribute).specified;
1536  }
1537};
1538
1539// IE is missing .innerHTML support for TABLE-related elements
1540if (document.all && !window.opera){
1541  Element.Methods.update = function(element, html) {
1542    element = $(element);
1543    html = typeof html == 'undefined' ? '' : html.toString();
1544    var tagName = element.tagName.toUpperCase();
1545    if (['THEAD','TBODY','TR','TD'].include(tagName)) {
1546      var div = document.createElement('div');
1547      switch (tagName) {
1548        case 'THEAD':
1549        case 'TBODY':
1550          div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';
1551          depth = 2;
1552          break;
1553        case 'TR':
1554          div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';
1555          depth = 3;
1556          break;
1557        case 'TD':
1558          div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';
1559          depth = 4;
1560      }
1561      $A(element.childNodes).each(function(node){
1562        element.removeChild(node)
1563      });
1564      depth.times(function(){ div = div.firstChild });
1565
1566      $A(div.childNodes).each(
1567        function(node){ element.appendChild(node) });
1568    } else {
1569      element.innerHTML = html.stripScripts();
1570    }
1571    setTimeout(function() {html.evalScripts()}, 10);
1572    return element;
1573  }
1574};
1575
1576Object.extend(Element, Element.Methods);
1577
1578var _nativeExtensions = false;
1579
1580if(/Konqueror|Safari|KHTML/.test(navigator.userAgent))
1581  ['', 'Form', 'Input', 'TextArea', 'Select'].each(function(tag) {
1582    var className = 'HTML' + tag + 'Element';
1583    if(window[className]) return;
1584    var klass = window[className] = {};
1585    klass.prototype = document.createElement(tag ? tag.toLowerCase() : 'div').__proto__;
1586  });
1587
1588Element.addMethods = function(methods) {
1589  Object.extend(Element.Methods, methods || {});
1590
1591  function copy(methods, destination, onlyIfAbsent) {
1592    onlyIfAbsent = onlyIfAbsent || false;
1593    var cache = Element.extend.cache;
1594    for (var property in methods) {
1595      var value = methods[property];
1596      if (!onlyIfAbsent || !(property in destination))
1597        destination[property] = cache.findOrStore(value);
1598    }
1599  }
1600
1601  if (typeof HTMLElement != 'undefined') {
1602    copy(Element.Methods, HTMLElement.prototype);
1603    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
1604    copy(Form.Methods, HTMLFormElement.prototype);
1605    [HTMLInputElement, HTMLTextAreaElement, HTMLSelectElement].each(function(klass) {
1606      copy(Form.Element.Methods, klass.prototype);
1607    });
1608    _nativeExtensions = true;
1609  }
1610}
1611
1612var Toggle = new Object();
1613Toggle.display = Element.toggle;
1614
1615/*--------------------------------------------------------------------------*/
1616
1617Abstract.Insertion = function(adjacency) {
1618  this.adjacency = adjacency;
1619}
1620
1621Abstract.Insertion.prototype = {
1622  initialize: function(element, content) {
1623    this.element = $(element);
1624    this.content = content.stripScripts();
1625
1626    if (this.adjacency && this.element.insertAdjacentHTML) {
1627      try {
1628        this.element.insertAdjacentHTML(this.adjacency, this.content);
1629      } catch (e) {
1630        var tagName = this.element.tagName.toUpperCase();
1631        if (['TBODY', 'TR'].include(tagName)) {
1632          this.insertContent(this.contentFromAnonymousTable());
1633        } else {
1634          throw e;
1635        }
1636      }
1637    } else {
1638      this.range = this.element.ownerDocument.createRange();
1639      if (this.initializeRange) this.initializeRange();
1640      this.insertContent([this.range.createContextualFragment(this.content)]);
1641    }
1642
1643    setTimeout(function() {content.evalScripts()}, 10);
1644  },
1645
1646  contentFromAnonymousTable: function() {
1647    var div = document.createElement('div');
1648    div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
1649    return $A(div.childNodes[0].childNodes[0].childNodes);
1650  }
1651}
1652
1653var Insertion = new Object();
1654
1655Insertion.Before = Class.create();
1656Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
1657  initializeRange: function() {
1658    this.range.setStartBefore(this.element);
1659  },
1660
1661  insertContent: function(fragments) {
1662    fragments.each((function(fragment) {
1663      this.element.parentNode.insertBefore(fragment, this.element);
1664    }).bind(this));
1665  }
1666});
1667
1668Insertion.Top = Class.create();
1669Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
1670  initializeRange: function() {
1671    this.range.selectNodeContents(this.element);
1672    this.range.collapse(true);
1673  },
1674
1675  insertContent: function(fragments) {
1676    fragments.reverse(false).each((function(fragment) {
1677      this.element.insertBefore(fragment, this.element.firstChild);
1678    }).bind(this));
1679  }
1680});
1681
1682Insertion.Bottom = Class.create();
1683Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
1684  initializeRange: function() {
1685    this.range.selectNodeContents(this.element);
1686    this.range.collapse(this.element);
1687  },
1688
1689  insertContent: function(fragments) {
1690    fragments.each((function(fragment) {
1691      this.element.appendChild(fragment);
1692    }).bind(this));
1693  }
1694});
1695
1696Insertion.After = Class.create();
1697Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
1698  initializeRange: function() {
1699    this.range.setStartAfter(this.element);
1700  },
1701
1702  insertContent: function(fragments) {
1703    fragments.each((function(fragment) {
1704      this.element.parentNode.insertBefore(fragment,
1705        this.element.nextSibling);
1706    }).bind(this));
1707  }
1708});
1709
1710/*--------------------------------------------------------------------------*/
1711
1712Element.ClassNames = Class.create();
1713Element.ClassNames.prototype = {
1714  initialize: function(element) {
1715    this.element = $(element);
1716  },
1717
1718  _each: function(iterator) {
1719    this.element.className.split(/\s+/).select(function(name) {
1720      return name.length > 0;
1721    })._each(iterator);
1722  },
1723
1724  set: function(className) {
1725    this.element.className = className;
1726  },
1727
1728  add: function(classNameToAdd) {
1729    if (this.include(classNameToAdd)) return;
1730    this.set($A(this).concat(classNameToAdd).join(' '));
1731  },
1732
1733  remove: function(classNameToRemove) {
1734    if (!this.include(classNameToRemove)) return;
1735    this.set($A(this).without(classNameToRemove).join(' '));
1736  },
1737
1738  toString: function() {
1739    return $A(this).join(' ');
1740  }
1741};
1742
1743Object.extend(Element.ClassNames.prototype, Enumerable);
1744var Selector = Class.create();
1745Selector.prototype = {
1746  initialize: function(expression) {
1747    this.params = {classNames: []};
1748    this.expression = expression.toString().strip();
1749    this.parseExpression();
1750    this.compileMatcher();
1751  },
1752
1753  parseExpression: function() {
1754    function abort(message) { throw 'Parse error in selector: ' + message; }
1755
1756    if (this.expression == '')  abort('empty expression');
1757
1758    var params = this.params, expr = this.expression, match, modifier, clause, rest;
1759    while (match = expr.match(/^(.*)\[([a-z0-9_:-]+?)(?:([~\|!]?=)(?:"([^"]*)"|([^\]\s]*)))?\]$/i)) {
1760      params.attributes = params.attributes || [];
1761      params.attributes.push({name: match[2], operator: match[3], value: match[4] || match[5] || ''});
1762      expr = match[1];
1763    }
1764
1765    if (expr == '*') return this.params.wildcard = true;
1766
1767    while (match = expr.match(/^([^a-z0-9_-])?([a-z0-9_-]+)(.*)/i)) {
1768      modifier = match[1], clause = match[2], rest = match[3];
1769      switch (modifier) {
1770        case '#':       params.id = clause; break;
1771        case '.':       params.classNames.push(clause); break;
1772        case '':
1773        case undefined: params.tagName = clause.toUpperCase(); break;
1774        default:        abort(expr.inspect());
1775      }
1776      expr = rest;
1777    }
1778
1779    if (expr.length > 0) abort(expr.inspect());
1780  },
1781
1782  buildMatchExpression: function() {
1783    var params = this.params, conditions = [], clause;
1784
1785    if (params.wildcard)
1786      conditions.push('true');
1787    if (clause = params.id)
1788      conditions.push('element.readAttribute("id") == ' + clause.inspect());
1789    if (clause = params.tagName)
1790      conditions.push('element.tagName.toUpperCase() == ' + clause.inspect());
1791    if ((clause = params.classNames).length > 0)
1792      for (var i = 0, length = clause.length; i < length; i++)
1793        conditions.push('element.hasClassName(' + clause[i].inspect() + ')');
1794    if (clause = params.attributes) {
1795      clause.each(function(attribute) {
1796        var value = 'element.readAttribute(' + attribute.name.inspect() + ')';
1797        var splitValueBy = function(delimiter) {
1798          return value + ' && ' + value + '.split(' + delimiter.inspect() + ')';
1799        }
1800
1801        switch (attribute.operator) {
1802          case '=':       conditions.push(value + ' == ' + attribute.value.inspect()); break;
1803          case '~=':      conditions.push(splitValueBy(' ') + '.include(' + attribute.value.inspect() + ')'); break;
1804          case '|=':      conditions.push(
1805                            splitValueBy('-') + '.first().toUpperCase() == ' + attribute.value.toUpperCase().inspect()
1806                          ); break;
1807          case '!=':      conditions.push(value + ' != ' + attribute.value.inspect()); break;
1808          case '':
1809          case undefined: conditions.push('element.hasAttribute(' + attribute.name.inspect() + ')'); break;
1810          default:        throw 'Unknown operator ' + attribute.operator + ' in selector';
1811        }
1812      });
1813    }
1814
1815    return conditions.join(' && ');
1816  },
1817
1818  compileMatcher: function() {
1819    this.match = new Function('element', 'if (!element.tagName) return false; \
1820      element = $(element); \
1821      return ' + this.buildMatchExpression());
1822  },
1823
1824  findElements: function(scope) {
1825    var element;
1826
1827    if (element = $(this.params.id))
1828      if (this.match(element))
1829        if (!scope || Element.childOf(element, scope))
1830          return [element];
1831
1832    scope = (scope || document).getElementsByTagName(this.params.tagName || '*');
1833
1834    var results = [];
1835    for (var i = 0, length = scope.length; i < length; i++)
1836      if (this.match(element = scope[i]))
1837        results.push(Element.extend(element));
1838
1839    return results;
1840  },
1841
1842  toString: function() {
1843    return this.expression;
1844  }
1845}
1846
1847Object.extend(Selector, {
1848  matchElements: function(elements, expression) {
1849    var selector = new Selector(expression);
1850    return elements.select(selector.match.bind(selector)).map(Element.extend);
1851  },
1852
1853  findElement: function(elements, expression, index) {
1854    if (typeof expression == 'number') index = expression, expression = false;
1855    return Selector.matchElements(elements, expression || '*')[index || 0];
1856  },
1857
1858  findChildElements: function(element, expressions) {
1859    return expressions.map(function(expression) {
1860      return expression.match(/[^\s"]+(?:"[^"]*"[^\s"]+)*/g).inject([null], function(results, expr) {
1861        var selector = new Selector(expr);
1862        return results.inject([], function(elements, result) {
1863          return elements.concat(selector.findElements(result || element));
1864        });
1865      });
1866    }).flatten();
1867  }
1868});
1869
1870function $$() {
1871  return Selector.findChildElements(document, $A(arguments));
1872}
1873var Form = {
1874  reset: function(form) {
1875    $(form).reset();
1876    return form;
1877  },
1878
1879  serializeElements: function(elements, getHash) {
1880    var data = elements.inject({}, function(result, element) {
1881      if (!element.disabled && element.name) {
1882        var key = element.name, value = $(element).getValue();
1883        if (value != undefined) {
1884          if (result[key]) {
1885            if (result[key].constructor != Array) result[key] = [result[key]];
1886            result[key].push(value);
1887          }
1888          else result[key] = value;
1889        }
1890      }
1891      return result;
1892    });
1893
1894    return getHash ? data : PHash.toQueryString(data);
1895  }
1896};
1897
1898Form.Methods = {
1899  serialize: function(form, getHash) {
1900    return Form.serializeElements(Form.getElements(form), getHash);
1901  },
1902
1903  getElements: function(form) {
1904    return $A($(form).getElementsByTagName('*')).inject([],
1905      function(elements, child) {
1906        if (Form.Element.Serializers[child.tagName.toLowerCase()])
1907          elements.push(Element.extend(child));
1908        return elements;
1909      }
1910    );
1911  },
1912
1913  getInputs: function(form, typeName, name) {
1914    form = $(form);
1915    var inputs = form.getElementsByTagName('input');
1916
1917    if (!typeName && !name) return $A(inputs).map(Element.extend);
1918
1919    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
1920      var input = inputs[i];
1921      if ((typeName && input.type != typeName) || (name && input.name != name))
1922        continue;
1923      matchingInputs.push(Element.extend(input));
1924    }
1925
1926    return matchingInputs;
1927  },
1928
1929  disable: function(form) {
1930    form = $(form);
1931    form.getElements().each(function(element) {
1932      element.blur();
1933      element.disabled = 'true';
1934    });
1935    return form;
1936  },
1937
1938  enable: function(form) {
1939    form = $(form);
1940    form.getElements().each(function(element) {
1941      element.disabled = '';
1942    });
1943    return form;
1944  },
1945
1946  findFirstElement: function(form) {
1947    return $(form).getElements().find(function(element) {
1948      return element.type != 'hidden' && !element.disabled &&
1949        ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
1950    });
1951  },
1952
1953  focusFirstElement: function(form) {
1954    form = $(form);
1955    form.findFirstElement().activate();
1956    return form;
1957  }
1958}
1959
1960Object.extend(Form, Form.Methods);
1961
1962/*--------------------------------------------------------------------------*/
1963
1964Form.Element = {
1965  focus: function(element) {
1966    $(element).focus();
1967    return element;
1968  },
1969
1970  select: function(element) {
1971    $(element).select();
1972    return element;
1973  }
1974}
1975
1976Form.Element.Methods = {
1977  serialize: function(element) {
1978    element = $(element);
1979    if (!element.disabled && element.name) {
1980      var value = element.getValue();
1981      if (value != undefined) {
1982        var pair = {};
1983        pair[element.name] = value;
1984        return PHash.toQueryString(pair);
1985      }
1986    }
1987    return '';
1988  },
1989
1990  getValue: function(element) {
1991    element = $(element);
1992    var method = element.tagName.toLowerCase();
1993    return Form.Element.Serializers[method](element);
1994  },
1995
1996  clear: function(element) {
1997    $(element).value = '';
1998    return element;
1999  },
2000
2001  present: function(element) {
2002    return $(element).value != '';
2003  },
2004
2005  activate: function(element) {
2006    element = $(element);
2007    element.focus();
2008    if (element.select && ( element.tagName.toLowerCase() != 'input' ||
2009      !['button', 'reset', 'submit'].include(element.type) ) )
2010      element.select();
2011    return element;
2012  },
2013
2014  disable: function(element) {
2015    element = $(element);
2016    element.disabled = true;
2017    return element;
2018  },
2019
2020  enable: function(element) {
2021    element = $(element);
2022    element.blur();
2023    element.disabled = false;
2024    return element;
2025  }
2026}
2027
2028Object.extend(Form.Element, Form.Element.Methods);
2029var Field = Form.Element;
2030var $F = Form.Element.getValue;
2031
2032/*--------------------------------------------------------------------------*/
2033
2034Form.Element.Serializers = {
2035  input: function(element) {
2036    switch (element.type.toLowerCase()) {
2037      case 'checkbox':
2038      case 'radio':
2039        return Form.Element.Serializers.inputSelector(element);
2040      default:
2041        return Form.Element.Serializers.textarea(element);
2042    }
2043  },
2044
2045  inputSelector: function(element) {
2046    return element.checked ? element.value : null;
2047  },
2048
2049  textarea: function(element) {
2050    return element.value;
2051  },
2052
2053  select: function(element) {
2054    return this[element.type == 'select-one' ?
2055      'selectOne' : 'selectMany'](element);
2056  },
2057
2058  selectOne: function(element) {
2059    var index = element.selectedIndex;
2060    return index >= 0 ? this.optionValue(element.options[index]) : null;
2061  },
2062
2063  selectMany: function(element) {
2064    var values, length = element.length;
2065    if (!length) return null;
2066
2067    for (var i = 0, values = []; i < length; i++) {
2068      var opt = element.options[i];
2069      if (opt.selected) values.push(this.optionValue(opt));
2070    }
2071    return values;
2072  },
2073
2074  optionValue: function(opt) {
2075    // extend element because hasAttribute may not be native
2076    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
2077  }
2078}
2079
2080/*--------------------------------------------------------------------------*/
2081
2082Abstract.TimedObserver = function() {}
2083Abstract.TimedObserver.prototype = {
2084  initialize: function(element, frequency, callback) {
2085    this.frequency = frequency;
2086    this.element   = $(element);
2087    this.callback  = callback;
2088
2089    this.lastValue = this.getValue();
2090    this.registerCallback();
2091  },
2092
2093  registerCallback: function() {
2094    setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
2095  },
2096
2097  onTimerEvent: function() {
2098    var value = this.getValue();
2099    var changed = ('string' == typeof this.lastValue && 'string' == typeof value
2100      ? this.lastValue != value : String(this.lastValue) != String(value));
2101    if (changed) {
2102      this.callback(this.element, value);
2103      this.lastValue = value;
2104    }
2105  }
2106}
2107
2108Form.Element.Observer = Class.create();
2109Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
2110  getValue: function() {
2111    return Form.Element.getValue(this.element);
2112  }
2113});
2114
2115Form.Observer = Class.create();
2116Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
2117  getValue: function() {
2118    return Form.serialize(this.element);
2119  }
2120});
2121
2122/*--------------------------------------------------------------------------*/
2123
2124Abstract.EventObserver = function() {}
2125Abstract.EventObserver.prototype = {
2126  initialize: function(element, callback) {
2127    this.element  = $(element);
2128    this.callback = callback;
2129
2130    this.lastValue = this.getValue();
2131    if (this.element.tagName.toLowerCase() == 'form')
2132      this.registerFormCallbacks();
2133    else
2134      this.registerCallback(this.element);
2135  },
2136
2137  onElementEvent: function() {
2138    var value = this.getValue();
2139    if (this.lastValue != value) {
2140      this.callback(this.element, value);
2141      this.lastValue = value;
2142    }
2143  },
2144
2145  registerFormCallbacks: function() {
2146    Form.getElements(this.element).each(this.registerCallback.bind(this));
2147  },
2148
2149  registerCallback: function(element) {
2150    if (element.type) {
2151      switch (element.type.toLowerCase()) {
2152        case 'checkbox':
2153        case 'radio':
2154          Event.observe(element, 'click', this.onElementEvent.bind(this));
2155          break;
2156        default:
2157          Event.observe(element, 'change', this.onElementEvent.bind(this));
2158          break;
2159      }
2160    }
2161  }
2162}
2163
2164Form.Element.EventObserver = Class.create();
2165Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
2166  getValue: function() {
2167    return Form.Element.getValue(this.element);
2168  }
2169});
2170
2171Form.EventObserver = Class.create();
2172Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
2173  getValue: function() {
2174    return Form.serialize(this.element);
2175  }
2176});
2177if (!window.Event) {
2178  var Event = new Object();
2179}
2180
2181Object.extend(Event, {
2182  KEY_BACKSPACE: 8,
2183  KEY_TAB:       9,
2184  KEY_RETURN:   13,
2185  KEY_ESC:      27,
2186  KEY_LEFT:     37,
2187  KEY_UP:       38,
2188  KEY_RIGHT:    39,
2189  KEY_DOWN:     40,
2190  KEY_DELETE:   46,
2191  KEY_HOME:     36,
2192  KEY_END:      35,
2193  KEY_PAGEUP:   33,
2194  KEY_PAGEDOWN: 34,
2195
2196  element: function(event) {
2197    return event.target || event.srcElement;
2198  },
2199
2200  isLeftClick: function(event) {
2201    return (((event.which) && (event.which == 1)) ||
2202            ((event.button) && (event.button == 1)));
2203  },
2204
2205  pointerX: function(event) {
2206    return event.pageX || (event.clientX +
2207      (document.documentElement.scrollLeft || document.body.scrollLeft));
2208  },
2209
2210  pointerY: function(event) {
2211    return event.pageY || (event.clientY +
2212      (document.documentElement.scrollTop || document.body.scrollTop));
2213  },
2214
2215  stop: function(event) {
2216    if (event.preventDefault) {
2217      event.preventDefault();
2218      event.stopPropagation();
2219    } else {
2220      event.returnValue = false;
2221      event.cancelBubble = true;
2222    }
2223  },
2224
2225  // find the first node with the given tagName, starting from the
2226  // node the event was triggered on; traverses the DOM upwards
2227  findElement: function(event, tagName) {
2228    var element = Event.element(event);
2229    while (element.parentNode && (!element.tagName ||
2230        (element.tagName.toUpperCase() != tagName.toUpperCase())))
2231      element = element.parentNode;
2232    return element;
2233  },
2234
2235  observers: false,
2236
2237  _observeAndCache: function(element, name, observer, useCapture) {
2238    if (!this.observers) this.observers = [];
2239    if (element.addEventListener) {
2240      this.observers.push([element, name, observer, useCapture]);
2241      element.addEventListener(name, observer, useCapture);
2242    } else if (element.attachEvent) {
2243      this.observers.push([element, name, observer, useCapture]);
2244      element.attachEvent('on' + name, observer);
2245    }
2246  },
2247
2248  unloadCache: function() {
2249    if (!Event.observers) return;
2250    for (var i = 0, length = Event.observers.length; i < length; i++) {
2251      Event.stopObserving.apply(this, Event.observers[i]);
2252      Event.observers[i][0] = null;
2253    }
2254    Event.observers = false;
2255  },
2256
2257  observe: function(element, name, observer, useCapture) {
2258    element = $(element);
2259    useCapture = useCapture || false;
2260
2261    if (name == 'keypress' &&
2262        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
2263        || element.attachEvent))
2264      name = 'keydown';
2265
2266    Event._observeAndCache(element, name, observer, useCapture);
2267  },
2268
2269  stopObserving: function(element, name, observer, useCapture) {
2270    element = $(element);
2271    useCapture = useCapture || false;
2272
2273    if (name == 'keypress' &&
2274        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
2275        || element.detachEvent))
2276      name = 'keydown';
2277
2278    if (element.removeEventListener) {
2279      element.removeEventListener(name, observer, useCapture);
2280    } else if (element.detachEvent) {
2281      try {
2282        element.detachEvent('on' + name, observer);
2283      } catch (e) {}
2284    }
2285  }
2286});
2287
2288/* prevent memory leaks in IE */
2289if (navigator.appVersion.match(/\bMSIE\b/))
2290  Event.observe(window, 'unload', Event.unloadCache, false);
2291var Position = {
2292  // set to true if needed, warning: firefox performance problems
2293  // NOT neeeded for page scrolling, only if draggable contained in
2294  // scrollable elements
2295  includeScrollOffsets: false,
2296
2297  // must be called before calling withinIncludingScrolloffset, every time the
2298  // page is scrolled
2299  prepare: function() {
2300    this.deltaX =  window.pageXOffset
2301                || document.documentElement.scrollLeft
2302                || document.body.scrollLeft
2303                || 0;
2304    this.deltaY =  window.pageYOffset
2305                || document.documentElement.scrollTop
2306                || document.body.scrollTop
2307                || 0;
2308  },
2309
2310  realOffset: function(element) {
2311    var valueT = 0, valueL = 0;
2312    do {
2313      valueT += element.scrollTop  || 0;
2314      valueL += element.scrollLeft || 0;
2315      element = element.parentNode;
2316    } while (element);
2317    return [valueL, valueT];
2318  },
2319
2320  cumulativeOffset: function(element) {
2321    var valueT = 0, valueL = 0;
2322    do {
2323      valueT += element.offsetTop  || 0;
2324      valueL += element.offsetLeft || 0;
2325      element = element.offsetParent;
2326    } while (element);
2327    return [valueL, valueT];
2328  },
2329
2330  positionedOffset: function(element) {
2331    var valueT = 0, valueL = 0;
2332    do {
2333      valueT += element.offsetTop  || 0;
2334      valueL += element.offsetLeft || 0;
2335      element = element.offsetParent;
2336      if (element) {
2337        if(element.tagName=='BODY') break;
2338        var p = Element.getStyle(element, 'position');
2339        if (p == 'relative' || p == 'absolute') break;
2340      }
2341    } while (element);
2342    return [valueL, valueT];
2343  },
2344
2345  offsetParent: function(element) {
2346    if (element.offsetParent) return element.offsetParent;
2347    if (element == document.body) return element;
2348
2349    while ((element = element.parentNode) && element != document.body)
2350      if (Element.getStyle(element, 'position') != 'static')
2351        return element;
2352
2353    return document.body;
2354  },
2355
2356  // caches x/y coordinate pair to use with overlap
2357  within: function(element, x, y) {
2358    if (this.includeScrollOffsets)
2359      return this.withinIncludingScrolloffsets(element, x, y);
2360    this.xcomp = x;
2361    this.ycomp = y;
2362    this.offset = this.cumulativeOffset(element);
2363
2364    return (y >= this.offset[1] &&
2365            y <  this.offset[1] + element.offsetHeight &&
2366            x >= this.offset[0] &&
2367            x <  this.offset[0] + element.offsetWidth);
2368  },
2369
2370  withinIncludingScrolloffsets: function(element, x, y) {
2371    var offsetcache = this.realOffset(element);
2372
2373    this.xcomp = x + offsetcache[0] - this.deltaX;
2374    this.ycomp = y + offsetcache[1] - this.deltaY;
2375    this.offset = this.cumulativeOffset(element);
2376
2377    return (this.ycomp >= this.offset[1] &&
2378            this.ycomp <  this.offset[1] + element.offsetHeight &&
2379            this.xcomp >= this.offset[0] &&
2380            this.xcomp <  this.offset[0] + element.offsetWidth);
2381  },
2382
2383  // within must be called directly before
2384  overlap: function(mode, element) {
2385    if (!mode) return 0;
2386    if (mode == 'vertical')
2387      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
2388        element.offsetHeight;
2389    if (mode == 'horizontal')
2390      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
2391        element.offsetWidth;
2392  },
2393
2394  page: function(forElement) {
2395    var valueT = 0, valueL = 0;
2396
2397    var element = forElement;
2398    do {
2399      valueT += element.offsetTop  || 0;
2400      valueL += element.offsetLeft || 0;
2401
2402      // Safari fix
2403      if (element.offsetParent==document.body)
2404        if (Element.getStyle(element,'position')=='absolute') break;
2405
2406    } while (element = element.offsetParent);
2407
2408    element = forElement;
2409    do {
2410      if (!window.opera || element.tagName=='BODY') {
2411        valueT -= element.scrollTop  || 0;
2412        valueL -= element.scrollLeft || 0;
2413      }
2414    } while (element = element.parentNode);
2415
2416    return [valueL, valueT];
2417  },
2418
2419  clone: function(source, target) {
2420    var options = Object.extend({
2421      setLeft:    true,
2422      setTop:     true,
2423      setWidth:   true,
2424      setHeight:  true,
2425      offsetTop:  0,
2426      offsetLeft: 0
2427    }, arguments[2] || {})
2428
2429    // find page position of source
2430    source = $(source);
2431    var p = Position.page(source);
2432
2433    // find coordinate system to use
2434    target = $(target);
2435    var delta = [0, 0];
2436    var parent = null;
2437    // delta [0,0] will do fine with position: fixed elements,
2438    // position:absolute needs offsetParent deltas
2439    if (Element.getStyle(target,'position') == 'absolute') {
2440      parent = Position.offsetParent(target);
2441      delta = Position.page(parent);
2442    }
2443
2444    // correct by body offsets (fixes Safari)
2445    if (parent == document.body) {
2446      delta[0] -= document.body.offsetLeft;
2447      delta[1] -= document.body.offsetTop;
2448    }
2449
2450    // set position
2451    if(options.setLeft)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
2452    if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
2453    if(options.setWidth)  target.style.width = source.offsetWidth + 'px';
2454    if(options.setHeight) target.style.height = source.offsetHeight + 'px';
2455  },
2456
2457  absolutize: function(element) {
2458    element = $(element);
2459    if (element.style.position == 'absolute') return;
2460    Position.prepare();
2461
2462    var offsets = Position.positionedOffset(element);
2463    var top     = offsets[1];
2464    var left    = offsets[0];
2465    var width   = element.clientWidth;
2466    var height  = element.clientHeight;
2467
2468    element._originalLeft   = left - parseFloat(element.style.left  || 0);
2469    element._originalTop    = top  - parseFloat(element.style.top || 0);
2470    element._originalWidth  = element.style.width;
2471    element._originalHeight = element.style.height;
2472
2473    element.style.position = 'absolute';
2474    element.style.top    = top + 'px';
2475    element.style.left   = left + 'px';
2476    element.style.width  = width + 'px';
2477    element.style.height = height + 'px';
2478  },
2479
2480  relativize: function(element) {
2481    element = $(element);
2482    if (element.style.position == 'relative') return;
2483    Position.prepare();
2484
2485    element.style.position = 'relative';
2486    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
2487    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
2488
2489    element.style.top    = top + 'px';
2490    element.style.left   = left + 'px';
2491    element.style.height = element._originalHeight;
2492    element.style.width  = element._originalWidth;
2493  }
2494}
2495
2496// Safari returns margins on body which is incorrect if the child is absolutely
2497// positioned.  For performance reasons, redefine Position.cumulativeOffset for
2498// KHTML/WebKit only.
2499if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
2500  Position.cumulativeOffset = function(element) {
2501    var valueT = 0, valueL = 0;
2502    do {
2503      valueT += element.offsetTop  || 0;
2504      valueL += element.offsetLeft || 0;
2505      if (element.offsetParent == document.body)
2506        if (Element.getStyle(element, 'position') == 'absolute') break;
2507
2508      element = element.offsetParent;
2509    } while (element);
2510
2511    return [valueL, valueT];
2512  }
2513}
2514
2515Element.addMethods();