Attaching Event Listeners

gistfile1.js

function attachListener(type, id, func){
     var element = document.getElementById(id);
     if(window.addEventListener){ // FF
		element.addEventListener(type, func, false);
		return true;
     } else if(window.attachEvent){ // IE
		element.attachEvent('on' + type, func);
		return true;
     } 
       else return false;
}