一起CSS

<ul id="nav">
<li><a href="#">Home<span>首　页</span></a></li>
<li><a href="#">About us<span>关于我们</span></a></li>
<li><a href="#">Products<span>产品展示</span></a></li>
<li><a href="#">Services<span>售后服务</span></a></li>
<li><a href="#">Contact<span>联系我们</span></a></li>
</ul>
<div id="navbar"></div>

* {
margin:0;
padding:0;
}  
#nav{
padding: 10px 10px 0;
font-size: 12px;
font-weight: bold;
font-family:Arial, Helvetica, sans-serif,宋体;
margin: 1em 0 0;
list-style:none;
}
#nav li{
float: left;
margin-right: 1px;
}
#nav li a,#nav li a:hover span{
line-height: 20px;
text-decoration: none;
background: #DDDDDD;
color: #666666;
display: block;
width: 80px;
text-align: center;
overflow:hidden;
}
#nav li a span{
display:none;
}
#nav a:hover{
position: relative;
}
#nav a:hover span{
display:block;
position:absolute;
top: 0;
left: 0;
cursor: pointer;
padding-top:2px;
}
#nav li a:hover,#nav li a:hover span{
color: #FFFFFF;
background: #DC4E1B;
}
#navbar{
background: #DC4E1B;
height: 8px;
overflow: hidden;
clear: both;
}