css tab 样式实现代码

<style type="text/css">
.demo-container
#tabnav{background:#d5d5d5;border-bottom:1px solid #333;padding-bottom:3px;width:510px;margin:0 auto}
.demo-container #tabnav ul{padding:15px 0px 5px 0px;margin:5px 0px 5px 0px;list-style:none;background:#f1f1f1;border-bottom:1px solid #999;line-height:120%}
.demo-container #tabnav ul li{display:inline;margin-left:10px}
.demo-container #tabnav ul li a{background:#fff;padding:5px 10px 5px 10px;border:1px solid #999;line-height:normal}
.demo-container #tabnav ul li a:hover{background:#ccc;color:#666}
.demo-container #tabnav ul li
a.here{background:#d5d5d5;padding:5px 10px 5px 10px;border-top:1px solid #999;border-left:1px solid #999;border-right:1px solid #999;border-bottom:1px solid #d5d5d5;color:#fff;font-weight:bold}
.demo-container #tabnav ul li a.here:hover{background:#d5d5d5}

</style>
<div id="tabnav">

<ul>
<li><a
href="#">首页</a></li><li><a
href="#" class="here">技术文章</a></li>
<li><a href="#">提交文章</a></li><li><a
href="#">联系我们</a></li></ul>
</div>