<!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>
#side { background: #99FF99; height: 300px; width: 120px; float: left; }
#main { background: #99FFFF; height: 300px; width: 70%; margin-left: 120px; }
</style>
<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 { width:500px; height:28px; margin:0 auto; border-bottom:3px solid #E10001;}
#menu ul { list-style: none; margin: 0px; padding: 0px; }
#menu ul li { float:left; margin-left:2px;}
#menu ul li a { display:block; width:87px; height:28px; line-height:28px; text-align:center; background:url(images/2010-08/17/091033_nav_bg.gif) 0 -28px no-repeat; font-size:14px;}
#menu ul li a:hover { background:url(images/2010-08/17/091033_nav_bg.gif) 0 -56px no-repeat;}
#menu ul li a#current { background:url(images/2010-08/17/091033_nav_bg.gif) 0 0 no-repeat; font-weight:bold; color:#fff;}
#menu ul li ul li { float:none;}
#menu ul li ul li a { background:none;}
#menu ul li ul { border:1px solid #ccc;position:absolute;}
#menu ul li ul li { float:none; width:85px; background:#eee; margin:0;}
#menu ul li ul li a { background:none;}
#menu ul li ul li a:hover { background:#333; color:#fff;}
#menu ul li ul { display:none; border:1px solid #ccc;}
#menu ul li:hover ul { display:block;}
H2 { position: relative; left: 10px; top: 0px; z-index: 0;color:red; }
H1 { position: relative; left: 33px; top: -35px; z-index: 1;color:green; }
</style>
</head></p>
<p><body>
<div id="side">此处显示 id "side" 的内容</div>
<div id="main">此处显示 id "main" 的内容</div>
<body>
<div id="menu">
<ul>
<li><a id="current" href="#">首页</a></li>
<li><a href="#">网页版式</a>
<ul>
<li><a href="#">自适应宽度</a></li>
<li><a href="#">固定宽度</a></li>
</ul>
</li>
<li><a href="#">web教程</a>
<ul>
<li><a href="#">新手入门</a></li>
<li><a href="#">视频教程</a></li>
<li><a href="#">常见问题</a></li>
</ul>
</li>
<li><a href="#">web实例</a></li>
<li><a href="#">常用代码</a></li>
</ul>
</div>
<h2 >我是H2</h2>
<h1>我是H1</h1>
</body>
</html>