<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk"/>
<style type="text/css">
.menu {font-family: arial, sans-serif; width:750px; position:relative; margin:0; font-size:11px; margin:50px 0;}
.menu ul li a, .menu ul li a:visited {display:block; text-decoration:none; color:#000; width:104px; height:20px; text-align:center; color:#fff; border:1px solid #fff; background:#710069; line-height:20px; font-size:11px;}
.menu ul {padding:0; margin:0;list-style-type: none; }
.menu ul li {float:left; margin-right:1px; position:relative;}
.menu ul li ul {display: none;}
.menu ul li a:hover {color:#fff; background:#36f;}
.menu ul li a:hover ul {display:block; position:absolute; top:21px; left:0px; width:104px;}
</style>
</head>
<body>
<div class="menu">
<ul>
<li><a href="#">DEMOS
<table><tr><td nowrap>
<ul>
<li><a href="#">zero dollars dollars dollars</a></li>
<li><a href="#">HOVER/CLICK aaaaaaa</a></li>
<li><a href="#">em sized images</a></li>
</ul>
</td></tr></table>
</a></li>
<li><a href="#">EXPLORER
<table><tr><td nowrap>
<ul>
<li><a href="#">example one</a></li>
<li><a href="#">vertical align</a></li>
</ul>
</td></tr></table>
</a></li>
</ul>
</div>
</body>
</html>
效果：
