用DIV+CSS弹出层来实现弹窗功能
    用window.open(),还是用window.showdialog弹出对话框都回被浏览器拦截,但是用DIV+CSS得方式实现,可以防止被拦截,于是再网上找到一个例子,原理就是在页面上加2个层,第一个层把页面全部盖住,防止用户点击其他地方,第二个层是一个显示内容的层,代码如下:
<!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>
<title>LIGHTBOX EXAMPLE</title>
<style>
html, body {
 height: 100%;
 width: 100%;
}
.white_content {
 display: none;
 position: absolute;
 top: 25%;
 left: 25%;
 width: 50%;
 border: 8px solid #D6E9F1;
 z-index:1002;
}
.black_overlay {
 display: none;
 position: absolute;
 top: 0%;
 left: 0%;
 width: 100%;
 height: 100%;
 background-color:#f5f5f5;
 z-index:1001;
 -moz-opacity: 0.8;
 opacity:.80;
 filter: alpha(opacity=80);
}
.close {
 float:right;
 clear:both;
 width:100%;
 text-align:right;
 margin:0 0 6px 0
}
.close a {
 color:#333;
 text-decoration:none;
 font-size:14px;
 font-weight:700
}
.con {
 text-indent:1.5pc;
 line-height:210px
}
</style>
<script>
function show(tag){
 	var light=document.getElementById(tag);
 	var fade=document.getElementById('fade');
 	light.style.display='block';
 	fade.style.display='block';
}
function hide(tag){
 var light=document.getElementById(tag);
 var fade=document.getElementById('fade');
 light.style.display='none';
 fade.style.display='none';
}
</script>
</head>
<body>
<a href="javascript:void(0)" onclick="show('light')">打开</a>
	<div id="light" class="white_content">
      		<div class="close"><a href="javascript:void(0)" onclick="hide('light')"> 关闭</a></div>
      		<div class="con"> 			
      			<br>			
      		</div>
	</div>
	<div id="fade" class="black_overlay"></div>
</body>
</html>