asp.net弹出层效果，遮盖背景的最好！能实现在弹出层上操作数据（比如登陆) ...

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<html >
<head runat="server">
    <title>无标题页</title>
    <script language="javascript" type="text/javascript">
    function showNo()
    {
      document.getElementById("doing").style.display="none";
      document.getElementById("divLogin").style.display="none";
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      document.getElementById("doing").style.width=range.width+"px";
      document.getElementById("doing").style.height = range.height+"px";
      document.getElementById("doing").style.display="block";
      document.getElementById("divLogin").style.display="";

    }
    function getRange()
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        var height = document.body.scrollHeight;
        var width = document.body.scrollWidth;

        if(top ==0 && left==0 && height==0 && width==0)
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           left = document.documentElement.scrollLeft;
           height = document.documentElement.clientHiehgt;
           width = document.documentElement.clientWidth;
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        return {top:top,left:left,height:height,width:width};
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</head>
<body>
    <form />
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    </div>
    </div>
    </form>
</body>
</html>