CSS遮罩层
<!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:100%;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;}
</style>
<script language="javascript" type="text/javascript" src="jquery-1.4.2.js"></script>
<script language="javascript" type="text/javascript">
function ShowDIV(thisObjID) {
$("#BgDiv").css({ display: "block", height: $(document).height() });
$("#" + thisObjID ).css("top", "100px");
$("#" + thisObjID ).css("display", "block");
}
function closeDiv(thisObjID) {
$("#BgDiv").css("display", "none");
$("#" + thisObjID).css("display", "none");
}
</script>
</head>
<body>
<div>
<input value="forlab" type="button" id="btnShow1" onclick="alert('forlab')" />
<div id="BgDiv"></div>
<!--遮罩层显示的DIV1-->
<div id="DialogDiv" style="display:none">
<h2>弹出层<a href="#" id="btnClose" onclick="javascript:closeDiv('DialogDiv')">关闭</a></h2>
<div class="form">我是弹出对话框forlab！</div>
</div>
<p>
<input value="弹出遮罩层1" type="button" id="btnShow1" onclick="ShowDIV('DialogDiv')" />
</p>
<div>
</body>
</html>
