jquery.scrolltop.js
/
demo.html

<!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=utf-8" />
<title>无标题文档</title>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jquery.scrolltop.js"></script>
<script type="text/javascript">
$(function(){
	  $.scrolltop();
});


</script>
</head>

<body>
	<div>
	     <ul class="c_nav" id="c_nav">
	          <li><a href="#">aaaaaa</a></li>
	          <li class="current"><a href="#">bbbbbb</a></li>
	          <li><a href="#">ccccccc</a></li>
	          <li><a href="#">dddddd</a></li>
	          <li><a href="#">eeeeeeeee</a></li>
	          <li><a href="#">fffffff</a></li>
	          <li><a href="#">gggggg</a></li>
	     </ul>

	</div>
	<div style="height:1000px;"></div>
</body>
</html>