centered nav menu fix

centerednav

#navigation {
position: relative;
}
#main-nav {
clear: left;
float: left;
list-style: none;
margin: 0;
padding: 0;
position: relative;
left: 50%;
text-align: center;
}
.nav li {
display: block;
float: left;
list-style: none;
margin: 0;
padding: 0;
position: relative;
right: 50%;
}
.nav li:hover, .nav li.hover {
position: relative;
}
.nav li ul li {
left: 0;
}