jQueryUI插件实现tabs效果

<!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 src="js/jquery-1.7.1.min.js"></script>
<script src="js/jquery-ui-1.8.18.custom.min.js"></script>
<link rel="stylesheet" href="jquery-ui-1.8.18.custom.css" />
<script>

$(function(){
 
 $("#tabs").tabs({
  event:"click",
  fx:{
   
   opacity:'toggle'
   },
  
  });

 
 });

</script>

</head>

<body>
<h1>tabs效果的实现</h1>
<div id="tabs">
<ul>
<li><a href="#tab_1">NO.1</a></li>
<li><a href="#tab_2">NO.2</a></li>
<li><a href="#tab_3">NO.3</a></li>
</ul>
<div id="tab_1">this is NO.1 content.</div>
<div id="tab_2">this is NO.2 content.</div>
<div id="tab_3">this is NO.3 content.</div>

</div>

</body>
</html>