Try this :
#catnav, #catnav ul {
display: block;
font-size: 8px;
line-height: 1;
list-style: none outside none;
margin: 0 auto;
padding: 0;
position: relative;
width: 594px;
z-index: 999;
}
Try this :
#catnav, #catnav ul {
display: block;
font-size: 8px;
line-height: 1;
list-style: none outside none;
margin: 0 auto;
padding: 0;
position: relative;
width: 594px;
z-index: 999;
}