var EventUtil = {     addHandler:function(element,type,handler){         if(element.addEventListener){             element.addEventListener(type,handler,false);         }else if(element.attachEvent){             element.attachEvent("on"+type,handler);         }else{             element["on"+type] = handler;         }     },     removeHandler:function(element,type,handler){         if(element.removeEventListener){             element.removeEventListener(type,handler,false);         }else if(element.detachEvent){             element.detachEvent("on"+type,handler);         }else{             element["on"+type] = null;         }     } }; var handler={     message:"Event handled",     handleClick:function(event){         alert(this.message);     } }; var btn=document.getElementById("btn"); EventUtil.adddHandler(btn,"click",bind(handler.handleClick,handler));