简单div遮罩

<!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>

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简单div遮罩

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