Jquery幾行程式碼解決跟隨螢幕滾動DIV

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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>jquery.text-effects</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<style>
#test
{
position: absolute;
top: 10px;
right: 10px;
width: 130px;
height: 60px;
background: #555;
color: #fff;
font-size: 13px;
}
</style>
<script src="http://img.jb51.net/jslib/jquery/jquery-1.3.2.min.js" type="text/javascript"></script>
<script language="javascript">
$(document).ready(function () {
var menuYloc = $("#test").offset().top;
$(window).scroll(function () {
var offsetTop = menuYloc   $(window).scrollTop()   "px";
$("#test").animate({ top: offsetTop }, { duration: 600, queue: false });
});
}); 
</script>
</head> 
<body> 
<h1>7行程式碼的跟隨螢幕滾動層.</h1> 
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<div id="test">Dev By CssRain.cn<br/>Test ie6 ,firefox3.0</div> 
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</body> 
</html>