DIV+JS弹出层并置灰窗口替不可点击状态

DIV+JS弹出层并置灰窗口为不可点击状态
    闲来无事,一直觉得在页面弹出一个DIV层,并把窗口置为不可点击态很好,就试了试,网上找的代码都比较复杂,不一定复杂的就是最好的!自己写了个比较简单的就几行代码!很简单的几行css,几行js,几个div。IE,360SE,火狐下测试可以完美弹出,全屏遮盖!
    直接看代码:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>弹出层</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="description" content="This is my page">
	<style> 
        .myd{
        	background: #77887E ;
        	height: 100%;
        	left: 0%;
        	right: 0%;
        	width: 100%;
        	position: absolute;
        	z-index: 10000;
        } 
        
        .pd{
        	background: #c2ee11 ;
        	height: 300px;
        	width: 450px;
        	position: absolute;
        	z-index: 10002;
        }
    </style> 
	
  </head>
  
  <script type="text/javascript">
	//var ie_name = navigator.appName; 
  
  function pop(){
   		var b = document.body;
						
		//设置边距为0,是为了全屏遮盖,否则上、右两边会留有边距,不能全屏遮盖
		b.style.margin=0;
		document.getElementById("md").style.display="block";
		
		//实现透明遮盖,如果不需要透明,不需要设置此属性
		document.getElementById("md").style.filter="alpha(opacity=80)";
		
		//clientWidth取的是实际窗口文档域的大小
		var _x = document.body.clientWidth;
		var _y = document.body.clientHeight;
		var a_w = 450;
		var a_h = 300;
		//alert(_x+" == " + _y);
		//计算弹出层的位置,目的是要显示在正中间
		var dleft = _x/2 - a_w/2;
		var dtop = _y/2 - a_h/2;
		//alert(dleft+" == "+dtop);
		var cd = document.getElementById("pd").style;
		//cd.setAttribute("left",dleft+"px");
		//cd.setAttribute("top",dtop+"px");
		cd.left=dleft+"px";
		cd.top = dtop+"px";
		cd.display="block";	}
	
	function close_div(){
		document.body.style.margin="";
		document.getElementById("md").style.display="none";
		document.getElementById("pd").style.display="none";
	}
</script>
  
  <body> 
  <!-- 遮盖层 -->
  <div class="myd" style="display: none" id="md"></div>
  
  <!-- 弹出层 -->
  <div class="pd" style="display: none" id="pd">
  	<div style="height: 20px;background: red;width: 100%;text-align: right">
  		点击关闭层:<button onclick="close_div()">X</button>
  	</div>
  	<label>这里是要显示的内容</label>
	
  </div>
  <input type="button" onclick="pop()" value="弹出层">  <br>
  	  This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
      This is my JSP page. <br>
  </body>
</html>


或者直接下载附件,运行看效果