superfish制作下拉菜单真的很方便而好很好用，而且还可以通过Superfish提供的参数来控制下拉菜单的不同效果，而且他没有层级限制，换句话说可以通过Superfish来写你想要的层级菜单。

官方帮助文档：

http://users.tpg.com.au/j_birch/plugins/superfish/#getting-started

1. Begin with a working pure CSS dropdown menu based on nested unordered lists. For each li:hover selector in your CSS, add an equivalent li.sfHover selector. Use display:none rather than left:-9999em to hide submenus. To make this step easy, there are cross-browser CSS files for a variety of menu types available in the download section of this site.

   <link href="superfish.css" rel="stylesheet" media="screen">

2. Link to the superfish.js file (after including jQuery) using a script tag in the head of your document.

   <script src="jQuery.js"></script>
   
   <script src="superfish.js"></script>

3. Call superfish() on the containing ul element.

   <script>
   
   	jQuery(document).ready(function() {
   
   		jQuery('ul.sf-menu').superfish();
   
   	});
   
   </script>

   There are many options available to customise your menu. You can find out about them in the Options tab of this site.

这是国内整理文件。

http://blog.chinaunix.net/uid-26615074-id-3078698.html