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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML>
<head>
<script>
var cover =mydiv= null;
window.onload = function() {
cover=document.getElementById('coverdiv');
cover.style.width = Math.max(document.documentElement.scrollWidth, document.documentElement.clientWidth) + "px";
cover.style.height = Math.max(document.documentElement.scrollHeight, document.documentElement.clientHeight) + "px"
cover.style.display = "none";
mydiv = document.getElementById('mydiv');
with (mydiv){
style.width = document.documentElement.scrollHeight/2+"px";
style.height = document.documentElement.scrollHeight/2+"px";
style.left = (document.documentElement.scrollWidth - mydiv.offsetWidth)/2+"px";
style.top = (document.documentElement.scrollHeight - mydiv.offsetHeight)/2+"px";
style.display = "none";
}
};
</script>
</head>
<BODY>
<div id='coverdiv' style="filter:alpha(opacity=80);Opacity:0.8; background-color:#aaaaaa; position:absolute; left:0px; top:0px;"> </div>
<div id='mydiv' style="border:1px solid #666666 ; padding:50px; position:absolute; background-color:#FFEE00">
我的层 <br>
<input value="关闭" type="button" onclick="javacript:mydiv.style.display =cover.style.display = 'none';" />
</div>
<input value='点击演示简单的遮罩层)' type="button" onclick="javascript:mydiv.style.display =cover.style.display = '';" />
</BODY> </HTML>