Jquery实现遮罩层，就是弹出DIV周围都灰色不能操作

<%@ page language="java" pageEncoding="UTF-8"%>

<!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>
  <meta
http-equiv="Content-Type" content="text/html; charset=gb2312"
/>
  <title>Jquery遮罩层</title>

  <style
type="text/css">
      #BgDiv{background-color:#e3e3e3;
position:absolute; z-index:99; left:0; top:0; display:none; width:100%;
height:1000px;opacity:0.5;filter: alpha(opacity=50);-moz-opacity: 0.5;}


      #DialogDiv{position:absolute;width:400px; left:50%; top:50%;
margin-left:-200px; height:auto; z-index:100;background-color:#fff; border:1px
#8FA4F5 solid; padding:1px;}
      #DialogDiv h2{ height:25px;
font-size:14px; background-color:#8FA4F5; position:relative; padding-left:10px;
line-height:25px;}
      #DialogDiv h2 a{position:absolute; right:5px;
font-size:12px; color:#000000}
      #DialogDiv .form{padding:10px;}


      #DialogDiv2{position:absolute;width:400px; left:50%; top:50%;
margin-left:-200px; height:auto; z-index:100;background-color:#fff; border:1px
#8FA4F5 solid; padding:1px;}
      #DialogDiv2 h2{ height:25px;
font-size:14px; background-color:#8FA4F5; position:relative; padding-left:10px;
line-height:25px;}
      #DialogDiv2 h2 a{position:absolute; right:5px;
font-size:12px; color:#000000}
      #DialogDiv2 .form{padding:10px;}


      #DialogDiv3{position:absolute;width:400px; left:50%; top:50%;
margin-left:-200px; height:auto; z-index:100;background-color:#fff; border:1px
#8FA4F5 solid; padding:1px;}
      #DialogDiv3 h2{ height:25px;
font-size:14px; background-color:#8FA4F5; position:relative; padding-left:10px;
line-height:25px;}
      #DialogDiv3 h2 a{position:absolute; right:5px;
font-size:12px; color:#000000}
      #DialogDiv3
.form{padding:10px;}
  </style>

  <script
language="javascript" type="text/javascript"
src="jquery-1.4.2.min.js"></script>
  <script
language="javascript" type="text/javascript">
   function
ShowDIV(thisObjID) {
          $("#BgDiv").css({ display: "block", height:
$(document).height() });
          var yscroll =
document.documentElement.scrollTop;
          $("#" + thisObjID ).css("top",
"100px");
          $("#" + thisObjID ).css("display",
"block");
    document.documentElement.scrollTop = 0;
      }

function closeDiv(thisObjID) {
          $("#BgDiv").css("display",
"none");
          $("#" + thisObjID).css("display", "none");

}
</script>

</head>

<body>
  <div
id="BgDiv"></div>

  
  <div
id="DialogDiv" style="display:none">
    <h2>弹出层<a href="#"
id="btnClose"
onclick="closeDiv('DialogDiv')">关闭</a></h2>
   <div
class="form">我是弹出对话框111111！！</div>
  </div>

  
  <div
id="DialogDiv2" style="display:none">
    <h2>弹出层<a href="#"
id="btnClose2"
onclick="closeDiv('DialogDiv2')">关闭</a></h2>
   <div
class="form">我是弹出对话框2222！！</div>
  </div>

  
  <div
id="DialogDiv3" style="display:none">
    <h2>弹出层<a href="#"
id="btnClose3"
onclick="closeDiv('DialogDiv3')">关闭</a></h2>
   <div
class="form">我是弹出对话框3333333！！</div>
  </div>

  <p>
   <input
value="弹出遮罩层1" type="button" id="btnShow1" onclick="ShowDIV('DialogDiv')"
/>
   <input value="弹出遮罩层2" type="button" id="btnShow2"
onclick="ShowDIV('DialogDiv2')" />
   <input value="弹出遮罩层3"
type="button" id="btnShow3" onclick="ShowDIV('DialogDiv3')"
/>
  </p>
</body>
</html>

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Jquery实现遮罩层，就是弹出DIV周围都灰色不能操作

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