Hi,
Very nice site.
A couple of things:
1 - I don't like your background image, you might want to stick to a solid color
2 - Would you consider making your color scheme more of a bluish color instead of the purple?
3 - You should make those aqua tabs look more sharp and clear and in focus, they look kind of blurry to me.
4 - Some of the text on the top banner part looks too faded, try increasing the intensity or the saturation or the opacity of the slogan.
5 - Why do you use imagemaps for your links. That purple bar with the two links should be made differently. Make a 1 pixel width by whatever height of that gradation from that bar and set that as the table cell background image. It will tile itself horizontally across the page and will help in your load time. Then just cut out your buttons and make those as pictures within the table cell. Same goes for your grey bar below it, and the very bottom bar.
6 - You might want to consider having some of your links either be CSS hover links so that people know absolutely that they are links, or if you want the images, perhaps rollovers to so that they do something when someone mouses over them.
7 - And finally, seeing as how this is a client site, you might consider making your custom error pages look exactly like the rest of the content, so that people have the option to quickly navigate to another part of the site that is within easy reach.
Other that that, the pictures and layout and load time are all very good. Loads nice and fast, (ADSL for me though), and I like the redundant navigation. Works on IE-6, NS-4.75, NS-6.2, Opera-6 and at 800*600 resolution.
Once again, very nice site, 9/10 from me.
Hope this helps!
NATE
design@spyderix-designz.com