<!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>
<title>DIV
CSS遮罩层</title>
<script
language="javascript"
type="text/javascript">
function showdiv()
{
document.getElementById("bg").style.display =
"block";
document.getElementById("show").style.display =
"block";
}
function hidediv()
{
document.getElementById("bg").style.display =
‘none‘;
document.getElementById("show").style.display =
‘none‘;
}
</script>
<style
type="text/css">
#bg{
display: none; position: absolute; top: 0%; left:
0%; width: 100%; height: 100%; background-color:
black; z-index:1001; -moz-opacity: 0.7;
opacity:.70; filter:
alpha(opacity=40);}
#show{display: none; position: absolute; top: 25%; left:
22%; width: 53%; height: 49%; padding: 8px;
border: 8px solid #E8E9F7; background-color: white;
z-index:1002; overflow: auto;}
</style>
</head>
<body>
<input id="btnshow" type="button" value="Show" onclick="showdiv();"
/>
<div
id="bg"></div>
<div
id="show">测试
<input
id="btnclose" type="button" value="Close" onclick="hidediv();"
/>
</div>
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</body>
</html>
原文：http://www.cnblogs.com/weibozeng/p/3527507.html