弹出层(Div)屏蔽父窗口并且让父窗口变暗

<html>  
<head>  
    <script>      
  function   locking(){      
  document.all.ly.style.display="block";      
  documentdocument.all.ly.style.width=document.body.clientWidth;      
  documentdocument.all.ly.style.height=document.body.clientHeight;      
  document.all.Layer2.style.display='block';      
  }      
  function   Lock_CheckForm(theForm){      
  document.all.ly.style.display='none';document.all.Layer2.style.display='none';   
  return   false;      
  }      
    </script>  
  
</head>  
<body>  
    <img src="http://powereasy.net/skin/since07/images/sf_cms_banner1.jpg">  
    <p align="center">  
        <input type="button" value="系统锁定" onclick="locking()">  
    </p>  
    <div id="ly" style="position: absolute; top: 0px; filter: alpha(opacity=60); background-color: #777;   
        z-index: 2; left: 0px; display: none;">  
    </div>  
    <!--         浮层框架开始         -->  
    <div id="Layer2" align="center" style="position: absolute; z-index: 3; left: expression((document.body.offsetWidth-540)/2); top: expression((document.body.offsetHeight-170)/2);   
        background-color: #fff; display: none;" >  
        <table width="540" border="0" cellpadding="0" cellspacing="0" style="border: 0   solid   #e7e3e7;   
            border-collapse: collapse">  
            <tr>  
                <td style="background-color: #73A2d6; color: #fff; padding-left: 4px; padding-top: 2px;   
                    font-weight: bold; font-size: 14px;" height="27" valign="middle">  
                    [&nbsp;警&nbsp;告&nbsp;]   
                </td>  
            </tr>  
            <tr>  
                <td height="130" align="center">  
                    <input type="button" value=" 确定 " onclick="Lock_CheckForm(this);">  
                </td>  
            </tr>  
        </table>  
    </div>  
    <!--         浮层框架结束         -->  
</body>  
</html>  

 

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