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Java doc:

http://docs.oracle.com/javaee/5/tutorial/doc/bnaaw.html

 

var EvenUtil = {
 addHandler:function(element,type,handler){
  //do something
 },
 getEvent:function(event){
  return event ? event:window.event;
 },
 getTarget:function(event){
  return event.target || event.srcElement;
 },
 preventDefault:function(event){
  if(event.preventDefault){
   event.preventDefault();
  } else {
   event.returnValue = false;
  }
 }, 
 removeHandler:function(element,type,handler){
  // dosomething
 },
 stopPropagation:function(event){
  if(event.stopPropagation){
   event.stopPropagation();
  } else {
   event.cancelBubble = true;
  }
 }
 
};

var list = document.getElementById("myLinks");
EventUtil.addHandler(list,"click",function(event){
 event = EventUtil.getEvent(event);
 var target = EventUtil.getTarget(event);
 switch(target.id) {
  case "doSomething":
   document.title = "I changed the document's title";
  case "goSomeWhere":
   location.href = "http://www.wrox.com";
  case "sayGoodbye":
   alert("hi");
   break;
 }
});