IE 6 Vertical Stacking of Nav Bar

[ChristianAbad]

I am unable to get the nav bar to display properly in IE 6. For some reason, the list elements are rendered vertically, rather than horizontally. I have reviewed every setting and the documentation to ensure that everything is configured properly. NOTE: This is working in FF 2 and IE 7.

To reproduce the issue, visit the following website using IE 6:
http://adserver.child-care-network.com/adserver/

Then, visit the same website using FF 2 or IE 7. You will see how the menus are supposed to look.

Can anyone provide some assistance here?

Thanks!

~Christian