nav {  
    float: left;   
    width: 100%;  
    background: url("nav_background.png");  
}

nav ul {  
    margin: 0 auto;  
    width: 940px;  
    list-style: none;  
} 
 
/* nav ul li {  
    float: left;  
} */



nav ul li{  
    display: inline-block; 
	margin-right: 5px;
    width: 140px;
}  

nav ul li a {
    font-size: 14px;  
    line-height: 44px;  
    text-align: center;  
    text-decoration: none;  
    color: #777; 
}