function addEvent(el ,type ,fn){

		if(el.addEventListener){

			el.addEventListener(type,fn,false);

		}else if(el.attachEvent){

			el.attachEvent('on'+type,fn);

		}else{

			el['on'+type] = fn;

		}

	}

    function alertIndex(){

    	alert(2);

    }

    addEvent(ipt[0],'click',function(){

    	alert(1)

    });

    addEvent(ipt[0],'click',alertIndex);