var Observer=new Class({Implements:[Options,Events],options:{periodical:false,delay:1000},initialize:function(el,onFired,options){this.setOptions(options);this.addEvent("onFired",onFired);this.element=$(el)||$$(el);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.changed.bind(this))}},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}});var $equals=function(obj1,obj2){return(obj1==obj2||JSON.encode(obj1)==JSON.encode(obj2))};