its good
i think youve done well, by dont use image buttons. text links are much better for search engines and its faster loading.
if you want to improve, i have some suggestions
- you could look more at color combinations, coz i think the yellow doesnt fit that well with the other colors. becoz you already got so much colors.
- you made the links standard underlined, i think that if you only change the color of links its better. it gives a more calm style. if you want to keep the underline, you could always put the links on underline on rollover.
i wish you good luck with advertising your site and keeping it up to date