var Observer=new Class({Implements:[Options,Events],options:{periodical:false,delay:1000},initialize:function(el,onFired,options){this.element=$(el)||$$(el);this.addEvent('onFired',onFired);this.setOptions(options);this.bound=this.changed.bind(this);this.resume()},changed:function(){var value=this.element.get('value');if($equals(this.value,value))return;this.clear();this.value=value;this.timeout=this.onFired.delay(this.options.delay,this)},setValue:function(value){this.value=value;this.element.set('value',value);return this.clear()},onFired:function(){this.fireEvent('onFired',[this.value,this.element])},clear:function(){$clear(this.timeout||null);return this},pause:function(){if(this.timer)$clear(this.timer);else this.element.removeEvent('keyup',this.bound);return this.clear()},resume:function(){this.value=this.element.get('value');if(this.options.periodical)this.timer=this.changed.periodical(this.options.periodical,this);else this.element.addEvent('keyup',this.bound);return this}});var $equals=function(obj1,obj2){return(obj1==obj2||JSON.encode(obj1)==JSON.encode(obj2))};