大神，帮我看看这段代码哪里错了
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{margin:0;padding:0;}
.head{font-size:12px;padding:6px 0 0 10px;}
#login_box{width:300px;height:150px;background:#eee;
border:1px solid #ccc;position:absolute;left:50%;top:50%;margin-left:-150px;margin-top:-75px;display:none;}
#login_box p{height:20px;border-bottom:1px solid #ccc;font-size:12px;padding:6px 0 0 5px;font-weight:bold;}
#close{width:14px;height:14px;background:url(close.png) no-repeat;position:absolute;right:4px;top:6px;}
</style>
<script>
window.onload=function(){
var login_btn=document.getElementById('login'),
login_box=document.getElementById('login_box'),
close=document.getElementById('close');
var eventUntil={
addHandler:function(ele,type,handler){
if(ele.addEventListener){
ele.addEventListener(type,handler,false);
}
else if(ele.attachEvent){
ele.attachEvent('on'+type,handler);
}
else{
ele['on'+type]=handler
}
}
showLogin:function(login_box){
login_box.style.display='block';
}
hideLogin:function(login_box){
login_box.style.display='none';
}
}
}
eventUntil.addHandler(login_btn,'click',showLogin);
eventUntil.addHandler(close,'click',hideLogin);
</script>
</head>
<body>
<div>亲，您好！<input type="button" value="登 录" id="login"></div>
<div id="login_box">
<p>用户登录</p><span id="close"></span>
</div>
</body>
</html>
