First of all I'd fix the 29 Errors and 21 warnings the W3C HTML Validator
found. There are 13 CSS errors according to the W3C CSS validator
also. Eliminating these as the cause is the first step.
I'd also start by adding the marbled background of the top bar as a background image in CSS for the table then go from there. Search engines don't read images (yet) so you may want to rethink using images as links.