Ditto what has been said. On your home page the pic above your nav buttons, it looks out of place, because it sits black over black on another pic. You might try a border or something to set it off if you want to keep it there. You are using the same back ground on all your pages, right? Why not make a template of the back ground with your nav buttons, and save it then use it to start every page, you have your nav buttons on each page and make it easier to get around inside the site, instead of haveing to go back to the home page each time.
that's just my oppinion.
Good Luck!!

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Mike

Any excuse for non performance only weakens the charactor