var Observer=new Class({Implements:[Options,Events],options:{periodical:false,delay:1000},initialize:function(c,a,b){this.element=$(c)||$$(c);this.addEvent("onFired",a);this.setOptions(b);this.bound=this.changed.bind(this);this.resume();},changed:function(){var a=this.element.get("value");if($equals(this.value,a)){return;}this.clear();this.value=a;this.timeout=this.onFired.delay(this.options.delay,this);},setValue:function(a){this.value=a;this.element.set("value",a);return this.clear();},onFired:function(){this.fireEvent("onFired",[this.value,this.element]);},clear:function(){$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(b,a){return(b==a||JSON.encode(b)==JSON.encode(a));};