怎样动态的为某控件“添加事件”？

<html><head>
<meta http-equiv="Content-Language" content="zh-cn">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>新建网页 1</title>
</head><body >
 
<input name="myTest2" id="myTest2" type="button" value="myTest2" ><script language="javascript">
    document.getElementById("myTest2").attachEvent("onclick",new Function('test("Hello")'));
function test(s){
 alert(s);
}
</script></body></html>