代码简介：
停靠在浏览器左侧的DIV+CSS隐藏菜单，鼠标放上后自动展开，移走鼠标自动隐藏，这也是一个比较常见的CSS特效，完全CSS代码实现，没有的掺杂任何JS代码，可以用到你网站的网站导航方面 ，因此更值得推荐了。
代码内容：
<!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>
<title>放在网页左侧的DIV+CSS隐藏菜单代码_网页代码站(www.webdm.cn)</title>
</head>
<style type="text/css">
body {
background: #fff;
font-family: "Lucida Grande", Helvetica, Arial, sans-serif;
font-size: 12px;
}
.menu {position:absolute; z-index:100; margin-top:20px;}
.menu ul {padding:0; margin:0; list-style-type: none; height:170px;}
.menu ul li {35px; text-align:left;}
* html .menu ul li {235px; margin-left:-16px; mar\gin-left:0;}
.menu ul li a, .menu ul li a:visited {display:block; text-decoration:none; 15px; padding:10px; background:transparent url
(http://www.webdm.cn/images/20090920/tab1.gif) top right; height:80px; text-align:center; border-left:1px solid #000;}
* html .menu ul li a, * html .menu ul li a:visited {35px; height:100px; w\idth:15px; he\ight:80px;}
table {margin:0; padding:0; border:0; border-collapse:collapse;font-size:1em;}
.menu ul li ul {visibility:hidden; position:absolute; 190px; top:0; left:0;}
.menu ul li:hover {position:relative;}
.menu ul li:hover a {padding-left:200px;}
.menu ul li a:hover {padding-left:201px; position:relative; z-index:200; border-left:0;}
.menu ul li:hover ul,
.menu ul li a:hover ul {visibility:visible; z-index:300;}
/* / */
.menu ul li:hover ul li a,
.menu ul li a:hover ul li a {display:block; background:#d8e2e2 url(http://www.webdm.cn/images/20090920/fade.gif); color:#888; text-align:left;
height:auto; padding:5px; border:1px solid #000; border-1px 1px 0 1px; 190px; w\idth:180px;}
.menu ul li:hover ul li a.last,
.menu ul li a:hover ul li a.last {border-bottom:1px solid #000;}
.menu ul li:hover ul li a:hover,
.menu ul li a:hover ul li a:hover {background:#e8f2f2; color:#000;}
.some_text {padding:0 20px 0 50px;}
</style>
<body>
<div class="menu">
<ul>
<li><a href="http://www.webdm.cn">D E M O S<!--[if IE 7]><!--></a><!--<![endif]-->
<table><tr><td>
<ul>
<li><a href="/" title="The zero dollar ads page">zero dollars advertising page</a></li>
<li><a href="/" title="Wrapping text around images">wrapping text around images</a></li>
<li><a href="/" title="Styling forms">styled form</a></li>
<li><a href="/" title="Removing active/focus borders">active focus</a></li>
<li><a href="/" title="Multi-position drop shadow">shadow boxing</a></li>
<li><a href="http://www.webdm.cn" title="Image Map for detailed information">image map for detailed information</a></li>
<li><a href="/" title="fun with background images">fun with background images</a></li>
<li><a href="/" title="fade-out scrolling">fade scrolling</a></li>
<li><a class="last" href="/" title="em size images compared">em image sizes compared</a></li>
</ul>
</td></tr></table>
<!--[if lte IE 6]></a><![endif]-->
</li>
<li><a href="index.html">B O X E S<!--[if IE 7]><!--></a><!--<![endif]-->
<table><tr><td>
<ul>
<li><a href="/" title="a coded list of spies">a coded list of spies</a></li>
<li><a href="/" title="a horizontal vertical menu">vertical menu</a></li>
<li><a href="http://www.webdm.cn" title="an enlarging unordered list">enlarging unordered list</a></li>
<li><a href="/" title="an unordered list with link images">link images</a></li>
<li><a href="/" title="non-rectangular links">non-rectangular</a></li>
<li><a href="/" title="jigsaw links">jigsaw links</a></li>
<li><a class="last" href="/" title="circular links">circular links</a></li>
</ul>
</td></tr></table><!--[if lte IE 6]></a><![endif]-->
</li>
</ul>
</div>
<div class="some_text">
<br>
<p><a href="http://www.webdm.cn">网页代码站</a> - 最专业的代码下载网站 - 致力为中国站长提供有质量的代码！</p>
</div>
</body>
</html>
代码来自：http://www.webdm.cn/webcode/ff1b5713-c2f8-493d-ba57-c7903dd3c201.html