制作让层随着滚动条滚动的效果

<div id="topBar">aaaaaaaaaaaaaaa</div>
//JS代码
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
	<script type="text/javascript" language="javascript">
	     $(window).scroll(function(){
	         $('#topBar').css('color',"red");
	         $('#topBar').css('top',$(document).scrollTop());
	     });
	</script>