JS弹出讯息提示层，绝对屏幕居中和背景变暗(仿windows关机效果)

JS弹出消息提示层，绝对屏幕居中和背景变暗(仿windows关机效果)
<!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=utf-8" />
<title>无标题文档</title>
<style type="text/css">
/*弹出层的STYLE*/
html,body {height:100%; margin:0px; font-size:12px;}
.mydiv {
	background-color: #ff6;
	border: 1px solid #f90;
	text-align: center;
	line-height: 40px;
	font-size: 12px;
	font-weight: bold;
	z-index:99;
	width: 300px;
	height: 120px;
	left:50%;/*FF IE7*/
	top: 50%;/*FF IE7*/
	margin-left:-150px!important;/*FF IE7 该值为本身宽的一半 */
	margin-top:-60px!important;/*FF IE7 该值为本身高的一半*/
	margin-top:0px;
	position:fixed!important;/*FF IE7*/
	position:absolute;/*IE6*/
	_top:       expression(eval(document.compatMode &&
				document.compatMode=='CSS1Compat') ?
				documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
				document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/
}

.bg {
	background-color: #ccc;
	width: 100%;
	height: 100%;
	left:0;
	top:0;/*FF IE7*/
	filter:alpha(opacity=50);/*IE*/
	opacity:0.5;/*FF*/
	z-index:1;
	position:fixed!important;/*FF IE7*/
	position:absolute;/*IE6*/
	_top:       expression(eval(document.compatMode &&
				document.compatMode=='CSS1Compat') ?
				documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
				document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/
}
/*The END*/
</style>
<script type="text/javascript">
	function showDiv(){
		document.getElementById('popDiv').style.display='block';
		document.getElementById('bg').style.display='block';
	}
	function closeDiv(){
		document.getElementById('popDiv').style.display='none';
		document.getElementById('bg').style.display='none';
	}
</script>
</head>
<body>

	<div style="padding-top: 20px;">
	<input type="Submit" name="" value="显示层" onclick="javascript:showDiv()" />
	</div>
	
	<div id="popDiv" class="mydiv" style="display:none;">恭喜你！<br/>你的成绩为:60分<br/>
	<a href="javascript:closeDiv()">关闭窗口</a></div>
	<div id="bg" class="bg" style="display:none;"></div>
	
	<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
	<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>


</body>
</html>
JS弹出讯息提示层，绝对屏幕居中和背景变暗(仿windows关机效果)

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