Quick question - Horizontal Nav Bar

[jcb33]

Hi all, I have 2 horizontal nav bars on my site, header and footer, but when I shrink my browser to a certain size, the information on them goes underneeth the bar, is there anyway to make it so the bar does not let things come off it? (Tried using overflow: hidden but it does not work)

http://cpanel.lincoln.ac.uk/dci125/index.shtml

Thanks!