<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type ="text/css" >
.main{ background-color:Silver; width :200px; height :100px; margin-left:40%; margin-top :200px; text-align :center;}
</style>
<script src="js/ui/jquery-1.7.1.min.js" type="text/javascript"></script>
<script language="javascript" type="text/javascript">
var n = 3;
function showTime() {
n--;
$('#divMain').html(n + ' 秒后关闭窗口');
if (n == 0)
window.close();
else
setTimeout('showTime()', 1000);
}
</script>
</head>
<body onload ="showTime()">
<form id="form1" runat="server">
<div id ="divMain" class ="main" >
</div>
</form>
</body>
</html>