#menu ul{
position: relative; 
left: 50%; 
float:left;
margin: 0; 
padding: 0; 
list-style: none;
}

#menu li{ 
display: inline; 
padding: 0; 
margin: 0; 
position: relative; 
left: -50%; 
float: left;
}

#menu li a{
display: block; 
border: 1px solid #666;
background-color: #ccc;
padding: 3px;
text-decoration: none;
color: #333;
width: 100px; 
margin: 1px;
text-align: center;
font-size: 14px;
}
#menu li a:hover{
background-color: #2d56be;
color: #fff;
}