一個很好的左邊下拉菜單

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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="UTF-8" lang="UTF-8">
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <meta http-equiv="Content-Language" content="UTF-8" />
 <title>後臺管理</title>
 <style type="text/css">
 body {margin:0;text-align:center;color:#000;font:normal 12px Arial,Verdana,Tahoma;text-align:center;background:#C8D0D5;line-height:150%;}
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 a:hover {text-decoration:underline}
 #menu {width:150px;margin:0px 15px;padding:0px;text-align:left;list-style:none}
 #menu .item {margin:5px 0px;padding:0px;list-style:none}
 a.title:link, a.title:visited, a.title:hover {display:block;background:url(http://www.tblog.com.cn/attachments/month_0609/m20069110491.gif) no-repeat;color:#385065;font-weight:bold;padding:2px 0 0 22px;width:128px;line-height:23px;cursor:pointer;text-decoration:none}
 #menu .item ul {border:1px solid #9FACB7;margin:0;width:118px;padding:3px 0px 3px 30px;background:#fff;list-style:none;display:none}
 #menu .item ul li {display:block;}
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 // --- 隱藏所有
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  var cookieString = sName + "=" + escape(sValue);
  //;判斷是否設置過期時間
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    var date = new Date();
    date.setTime(date.getTime + expireHours * 3600 * 1000);
    cookieString = cookieString + "; expire=" + date.toGMTString();
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 //--- 獲取cookie
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     HideAll();
     o.style.display = "block";
     setCookie("show_item",this.name);
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 </script>
</head>
<body>
<ul id="menu">
 <li class="item"><a href="javascript:void(0)" class="title" name="1">基本信息</a>
   <ul id="opt_1" class="optiton">
    <li><a href="#">企業簡介</a></li>
    <li><a href="#">企業新聞</a></li>
   </ul>
 </li>
 <li class="item"><a href="javascript:void(0)" class="title" name="2">系統管理</a>
   <ul id="opt_2" class="optiton">
    <li><a href="#">企業簡介</a></li>
    <li><a href="#">企業新聞</a></li>
   </ul>
 </li>
 <li class="item"><a href="javascript:void(0)" class="title" name="3">系統管理</a>
   <ul id="opt_3" class="optiton">
    <li><a href="#">會員管理</a></li>
    <li><a href="#">管理員設置</a></li>
    <li><a href="#">權限組設置</a></li>
    <li><a href="#">退出系統</a></li>
   </ul>
 </li>
</ul>
</body>
</html>
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