#topnav{
background: none; 
margin-right: auto;
margin-left: auto;
height: 171px;
width: 723px;
}
#img_div{
display:none;
}


#mainnav {
padding: 0;
/* height: auto; */
background: none repeat scroll 0 0 #4d4b87;
width: 100%;
margin-top: 34px;
overflow: visible;
float: left;
text-align: left;
min-height: 40px;
}

#nav_section{
margin-left: 30px;
}

.top_links{
margin-top: 6px;
font-size: 14px;
}