点击打开效果

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB2312" />
<title>弹出提示</title>
<style>
* {margin:0;padding:0;font-size:12px;}
html,body {height:100%;width:100%;}
#content {background:#f8f8f8;padding:30px;height:100%;}
#content a {font-size:30px;color:#369;font-weight:700;}
#alert {border:1px solid #369;width:300px;height:150px;background:#e2ecf5;z-index:1000;position:absolute;display:none;}
#alert h4 {height:20px;background:#369;color:#fff;padding:5px 0 0 5px;}
#alert h4 span {float:left;}
#alert h4 span#close {margin-left:210px;font-weight:500;cursor:pointer;}
#alert p {padding:12px 0 0 30px;}
#alert p input {width:120px;margin-left:20px;}
#alert p input.myinp {border:1px solid #ccc;height:16px;}
#alert p input.sub {width:60px;margin-left:30px;}
</style>

</head>

<body>
<div id="content">
<a href="#">注册</a>
</div>
<div id="alert">
<h4><span>现在注册</span><span id="close">关闭</span></h4>
<p><label>用户名</label><input type="text" class="myinp" onmouseover="this.style.border='1px solid #f60'" onfoucs="this.style.border='1px solid #f60'" onblur="this.style.border='1px solid #ccc'" /></p>
<p><label>密　码</label><input type="password" class="myinp" onmouseover="this.style.border='1px solid #f60'" onfoucs="this.style.border='1px solid #f60'" onblur="this.style.border='1px solid #ccc'" /></p>
<p><input type="submit" value="注册" class="sub" /><input type="reset" value="重置" class="sub" /></p>
</div>
<script type="text/javascript">
var myAlert = document.getElementById("alert");
var reg = document.getElementById("content").getElementsByTagName("a")[0];
var mClose = document.getElementById("close");
reg.onclick = function()
{
myAlert.style.display = "block";
myAlert.style.position = "absolute";
myAlert.style.top = "50%";
myAlert.style.left = "50%";
myAlert.style.marginTop = "-75px";
myAlert.style.marginLeft = "-150px";

mybg = document.createElement("div");
mybg.setAttribute("id","mybg");
mybg.style.background = "#000";
mybg.style.width = "100%";
mybg.style.height = "100%";
mybg.style.position = "absolute";
mybg.style.top = "0";
mybg.style.left = "0";
mybg.style.zIndex = "500";
mybg.style.opacity = "0.3";
mybg.style.filter = "Alpha(opacity=30)";
document.body.appendChild(mybg);

document.body.style.overflow = "hidden";
}

mClose.onclick = function()
{
myAlert.style.display = "none";
mybg.style.display = "none";
}
</script>
</body>
</html>