CSS竖直菜单，好棒！

答案：<!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=utf8" />
<title>好棒！CSS竖直菜单</title>
<style type="text/css">
body {
	background: black;
	margin: 0;
	padding: 0;
}
a:focus {
	outline: none;
}
ul.sidenav {
	font-size:9pt;
	float: left;
	width: 200px;
	list-style: none;
	background: #005094;
	border-bottom: 1px solid #3373a9;
	border-top: 1px solid #003867;
}
ul.sidenav li a{
	display: block;
	color: #fff;
	text-decoration: none;
	width: 155px;
	padding: 10px 10px 10px 35px;
	background: url(/jscss/demoimg/200907/sidenav_a.gif) no-repeat 5px 7px;
	border-top: 1px solid #3373a9;
	border-bottom: 1px solid #003867;
}
ul.sidenav li a:hover {
	background: #003867 url(/jscss/demoimg/200907/sidenav_a.gif) no-repeat 5px 7px;
	border-top: 1px solid #1a4c76;
}
ul.sidenav li span{	display: none; }
ul.sidenav li a:hover span {
	display: block;
	font-size: 9pt;
	padding: 10px 0;
}
</style>
</head>
<body>
<ul class="sidenav">
	<li>
		<a href="#">关于我们
		<span>网站的介绍。</span>
		</a>
	</li>
	<li>
		<a href="#">站长博客
		<span>讲述站长的故事……</span>
		</a>
	</li>
	<li>
		<a href="#">现在下载
		<span>精品源代码，想下就下</span>
		</a>
	</li>
	<li>
		<a href="#">源码论坛
		<span>讨论WEB前端及后端</span>
		</a>
	</li>
	<li>
		<a href="#">官方客服
		<span>向您介绍精品服务</span>
		</a>
	</li>
</ul>
</body>
</html>
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