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body { font-family: Verdana; font-size: 12px; line-height: 1.5;background:#000}
a { color: #000; text-decoration: none; }
a:hover { color: #F00; }
#menu { solid:#CCC; height:26px;background: #eee;filter:alpha(opacity=50); -moz-opacity:0.5; -khtml-opacity: 0.5; opacity: 0.5;}
#menu ul { list-style: none; margin: 0px; padding: 0px; }
#menu ul li { float:left; padding: 0px 8px; height: 26px; line-height: 26px;}
#menu ul li ul { solid:#ccc;position:absolute;;}
#menu ul li ul li { float:none; width:85px;background:#eee; margin:0;height: 26px; line-height: 26px;}
#menu ul li ul li a { background:none;}
#menu ul li ul li a:hover { background:#333; color:#fff;}
#menu ul li ul li{ display:none;solid:#ccc;height: 26px; line-height: 26px;}
#menu ul li:hover ul li{ display:block;}
#menu ul li ul li ul{ display:none; position: relative; left: 93px; top:-26px; width:100px; border-bottom:none; background:#eee;}
#menu ul li ul li:hover ul{ display:block;}
#menu ul ul{background: #eee;filter:alpha(opacity=50);}/*IE多增加这句就行了,IE没有继承到#menu的透明*/
<!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=gb2312" />
<style type="text/css">
body { font-family: Verdana; font-size: 12px; line-height: 1.5;}
a { color: #000; text-decoration: none; }
a:hover { color: #F00; }
#menu { solid:#CCC; height:26px;background: #eee;filter:alpha(opacity=50); -moz-opacity:0.5; -khtml-opacity: 0.5; opacity: 0.5;}
#menu ul { list-style: none; margin: 0px; padding: 0px; }
#menu ul li { float:left; padding: 0px 8px; height: 26px; line-height: 26px;}
#menu ul li ul { solid:#ccc;position:absolute;;}
#menu ul li ul li { float:none; width:85px;background:#eee; margin:0;height: 26px; line-height: 26px;}
#menu ul li ul li a { background:none;}
#menu ul li ul li a:hover { background:#333; color:#fff;}
#menu ul li ul li{ display:none;solid:#ccc;height: 26px; line-height: 26px;}
#menu ul li:hover ul li{ display:block;}
#menu ul li ul li ul{ display:none; position: relative; left: 93px; top:-26px; width:100px; border-bottom:none; background:#eee;}
#menu ul li ul li:hover ul{ display:block;}
</style>
</head>
<body>
<div id="menu">
<ul>
<li><a id="current" href="#">首页</a></li>
<li><a href="#">学科辅导</a>
<ul>
<li><a href="#">小学辅导</a>
<ul>
<li><a href="#">个性1对1</a></li>
<li><a href="#">精品小班</a></li>
<li><a href="#">乐学中班</a></li>
</ul>
</li>
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<ul>
<li><a href="#">个性2对2</a></li>
<li><a href="#">精品小班</a></li>
<li><a href="#">乐学中班</a></li>
</ul>
</li>
</ul>
</li>
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<ul>
<li><a href="#">小小书法家</a></li>
<li><a href="#">我是小画家</a></li>
</ul>
</li>
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<ul>
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<li><a href="#">托管班</a></li>
<li><a href="#">幼小衔接</a></li>
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<li><a href="#">初升高</a></li>
<li><a href="#">会员专享</a>
<ul>
<li><a href="#">学力测评</a></li>
<li><a href="#">心理咨询</a></li>
<li><a href="#">公益讲座</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">新闻动态</a></li>
<li><a href="#">关于我们</a></li>
<li><a href="#">一支笔论坛</a></li>
<li><a href="#">信息管理</a></li>
</ul>
</div>
</body>
</html>
#menu ul li ul li { float:none; width:85px;background:#eee; margin:0;height: 26px; line-height: 26px;filter:alpha(opacity=50); -moz-opacity:0.5; -khtml-opacity: 0.5; opacity: 0.5}
应该改成
#menu ul li ul li { float:none; width:85px;background:#eee; margin:0;height: 26px; line-height: 26px;}