CSS实现带滚动条的二级竖直菜单

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=gb2312" />
<title>CSS实现带滚动条的二级竖直菜单</title>
</head>
<style type="text/css">
.menu 
{font-family: verdana, arial, sans-serif; width:500px; padding:20px 0 100px 100px; position:relative;z-index:100;}
.menu ul 
{padding:0; margin:0; list-style-type: none; border:0;}
.menu ul li 
{float:left; position:relative; margin-right:1px;}
.menu ul li a, 
.menu ul li a:visited 
{display:block; text-align:left; text-decoration:none; width:150px; height:25px; color:#aaa; background:#fff url(/jscss/demoimg/200906/tab.gif); line-height:24px; font-size:11px; text-indent:10px;}
table {border-collapse:collapse;margin:0; padding:0;}
.menu ul li ul {display:none; text-align:left; position:absolute; top:25px; left:-20px; text-align:left;z-index:100; padding:0 30px 20px 20px; background:url(/jscss/demoimg/200906/tab_bot.gif) 20px 100% no-repeat;}
.menu ul li:hover a, 
.menu ul li a:hover
{color:#fff; border:0;}
.menu ul li:hover ul, 
.menu ul li a:hover ul
{display:block;}
.menu ul li:hover ul li, 
.menu ul li a:hover ul li
{background:#363636; color:#000; width:149px; height:100px;overflow:auto; border-left:1px solid #7a7a7a;}
/*hack the widht for IE5.5 */
* html .menu ul li a:hover ul li {width:150px; w\idth:149px;}
.menu ul li:hover ul li a, 
.menu ul li a:hover ul li a
{float:left; display:block; background:#363636; color:#aaa; width:129px; text-align:left; text-decoration:none; border:0; text-indent:10px;}
.menu ul li:hover ul li a:hover,
.menu ul li a:hover ul li a:hover
{text-decoration:none; color:#fff; background:#222;}
</style>
<!--[if lt IE 7]>
<style type="text/css">
.menu ul li ul {display:block; visibility:hidden;}
.menu ul li a:hover ul {visibility:visible;}
</style>
<![endif]-->
<!--[if IE]>
<style type="text/css">
.menu ul li:hover ul li,
.menu ul li a:hover ul li
{
scrollbar-arrow-color: #aaa;
scrollbar-3dlight-color: #888;
scrollbar-highlight-color: #666;
scrollbar-face-color: #444;
scrollbar-shadow-color: #000;
scrollbar-darkshadow-color: #888;
scrollbar-track-color: #363636;
}
</style>
<![endif]-->
<body>
<div class="menu">
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