jquery drop-down menu

This is the JQ code, JQ1 version is compatible with IE, JQ2 and above the version completely regardless of IE.

<script type= "Text/javascript" src= "Js/jquery-1.4.2.js" ></script>
<script type= "Text/javascript" >
$ (document). Ready (function () {
$ ("#nav li"). Hover (function () {
$ (this). FIND ("ul"). Slidedown ("slow");
},function () {
$ (this). FIND ("ul"). Slideup ("fast");
});
});
</script>

This part is CSS style, can be used directly

@charset "Utf-8";
*{margin:0;padding:0;list-style-type:none;}
a,img{border:0;}
Body{font:12px/normal Verdana, Arial, Helvetica, Sans-serif;}

/*nav*/
#nav. Mainlevel{background: #ffe60c; float:left;border-right:1px solid #fff; Width:140px;/*ie6 only*/}
#nav. Mainlevel a{color: #000; text-decoration:none;line-height:32px;display:block;padding:0 20px;width:100px;}
#nav. Mainlevel a:hover, #nav. Mainlevel a.cur{color: #fff; text-decoration:none;background: #062723 url (.. /images/slide-panel_03.png) 0 0 repeat-x;}
#nav. Mainlevel Ul{display:none;position:absolute;}
#nav. Mainlevel li{border-top:1px solid #fff; background: #ffe60c; width:140px;/*ie6 only*/}

This part is the HTML structure

<ul id= "nav";
<li class= "Mainlevel";
<a href= "http://sc.chinaz.com/jiaoben/" > Level navigation </　　　　　　A>
<ul>
<li><a href= "http://sc.chinaz.com/jiaoben/" > Two-level navigation 1</a></li>
<li><a href= "http://sc.chinaz.com/jiaoben/" > Two-level navigation 2</a></li>
<li><a href= "http ://sc.chinaz.com/jiaoben/"> Two-level navigation 3</a></li>
</ul>
</li>

<li class= "Mainlevel" >
<a href= "http://sc.chinaz.com/jiaoben/" > Level navigation </a>
<ul>
<li><a href= "http://sc.chinaz.com/jiaoben/" > Level two navigation 1</a></li>
<li><a href= "http://sc.chinaz.com/jiaoben/" > Level two navigation 2</a></li>
<li><a href= "http://sc.chinaz.com/jiaoben/" > Level two navigation 3</a></li>
</ul>
</li>
</ul>

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jquery drop-down menu