function addEvent(obj, evType, fn){ 

		 if (obj.addEventListener){ 
		   obj.addEventListener(evType, fn, false); 
		   return true; 
		 } else if (obj.attachEvent){ 
		   var r = obj.attachEvent("on"+evType, fn); 
		   return r; 
		 } else { 
		   return false; 
		 } 
		}