Code:
<!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></title>
<style>
ul,li{padding:0;margin:0;list-style:none}
li{float:left;width:80px;height:30px;line-height:30px}
a{display:block;background-color:red;color:#fff;font-size:12px;width:100%;height:100%;text-align:center;text-decoration
:none}
a:hover{background-color:green}
</style>
</head>
<body>
<ul>
<li><a href="#" >网站首页</a></li>
<li><a href="#" >技术文档</a></li>
<li><a href="#" >美女写真</a></li>
<li><a href="#" >经典论坛</a></li>
</ul>
</body>
</html>