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<!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></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
$("#btnClose").click(function() {
$("#BgDiv").css("display", "none");
$("#DialogDiv").css("display", "none");
});
$("#btnCancel").click(function() {
$("#BgDiv").css("display", "none");
$("#DialogDiv").css("display", "none");
});
$("#btnTest").click(function() {
$("#BgDiv").css({ display: "block", height: $(document).height() });
var yscroll = document.documentElement.scrollTop;
$("#DialogDiv").css("top", "100px").css("display", "block");
});
})
</script>
<style type="text/css">
body,h2{margin:0 ; padding:0;}
#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;}
</style>
</head>
<body>
<input type="button" id="btnTest" value="点击我" />
<div id="BgDiv"></div>
<div id="DialogDiv" style="display:none">
<h2>弹出层<a href="#" id="btnClose">关闭</a></h2>
<div class="form">
<input type="text" id="txtTest" onclick="this.value='';" onblur="if(this.value='')this.value='请输入姓名';" value="请输入姓名" />
<input type="button" value="取消" id="btnCancel" />
</div>
</div>
</body>
</html>