my personal changes would be:

1) lose the animated (java?) message board, as it looks quite tacky and there is no good reason why any news cant go on the home page.
2) i like the idea of blues, but choose more pastelly ones, not the standard ones you have used. if you are not very confident with css navigation, use this list-o-matic to create one for you, which you can then get your head arround and edit to your needs:

http://www.accessify.com/tools-and-w.../list-o-matic/

3) move the navigation to the left where the notice board currently is. you have too many pages IMO to have it along the top, as it only just fits in 1024x768.

those 3 things would make a massive improvement