CSS driving me nuts!

EDIT: FIXED

Hi ya guys, seem to have some trouble with my CSS, its not working as I expected!

Ok the problem is with the Navigation, this is what it is meant to look like. However this is what it has come out like.

I think the problem is that each of the links has a division (<div>), but this is necessary as each link must be exactly 75 pixels wide. I expected them to line up side by side, yet they are going one underneath the other. You can't see them as they are being covered by the black bit, it should say "Home, Forums. Portfolio, Partners".

Any help would be appreciated, sorry if it a little confusing.

Thanks,
Opserty.