页面水平导航菜单在符动的情况下也能随内容多少自适应居中啦！
<!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=utf-8" />
<style type="text/css">
ul{margin:0;padding:0;list-style:none;}
#nav{font-family:Verdana,Arial,sans-serif;font-size:12px;margin:120px auto;padding:0;text-align:center;}
#nav ul{display:inline-block;*display:inline;*zoom:1;border:solid 1px red;padding:10px;}
#nav li{height:30px;float:left;}
#nav li a{float:left;height:30px;line-height:30px;padding:0 23px;background:#97C099;}
#nav li a:hover{background:#59c099;color:#fff;}
</style>
<title>float菜单局中法</title>
</head>
<body>
<div id="nav">
<ul>
<li><a href="#">首页</a></li>
<li><a href="#">新闻中心</a></li>
<li><a href="#">商品展示</a></li>
<li><a href="#">会员中心</a></li>
<li><a href="#">购物车</a></li>
<li><a href="#">客户服务</a></li>
</ul>
</div>
</body>
</html>