pretty good matey, and the main structure is done with layers which is good but i cant understand why tables have been used for the menu and content...
lists are the best bet for nice menus (along with css based mouseover, so no need for javascript menus)
layers again for the content too. tables should be for tabular data only.
also looks like some css is in the main html code and some is in its own stylesheet. try and get it all in the same place if poss mate!
im a web designer and im just being picky btw! feel free to tell me to fook off!