二级导航菜单

<div id="nav">
<ul>
<li class="first"><a href="#">Home</a></li>
<li><a href="#">About Me</a></li>
<li><a href="#">Portfolio</a>
<ul>
<li><a href="#">Web</a></li>
<li><a href="#">Print</a></li>
<li><a href="#">Photos</a></li>
</ul>
</li>
<li><a href="#">Contact Me</a></li>
</ul>
</div>

#nav {
font-family: arial, sans-serif;
position: relative;
width: 390px;
height:56px;
font-size:14px;
color:#999;
margin: 0 auto;
}
#nav ul {
list-style-type: none;
}
#nav ul li {
float: left;
position: relative;
}
#nav ul li a {
text-align: center;
border-right:1px solid #e9e9e9;
padding:20px;
display:block;
text-decoration:none;
color:#999;
}
#nav ul li ul {
display: none
}
#nav ul li:hover ul {
display: block;
position: absolute;
}
#nav ul li:hover ul li a {
display:block;
background:#12aeef;
color:#ffffff;
width: 110px;
text-align: center;
border-bottom: 1px solid #f2f2f2;
border-right: none;
}
#nav ul li:hover ul li a:hover {
background:#6dc7ec;
color:#fff;
}