asp.net not looking different in IE compatibility view

I have an asp.net site which when viewed in IE, although the content is fine, the header and menubuttons are mis-aligned when not in compatibility view. When compatibility view is on the items appear as they are on the masterpage.

Its a small site (not live yet so cant give a link) and Ive not used CSS for the masterpage, just put the header image and menubuttons inside an html table.

As I say, everything else looks fine, it just these items. Is there anything obvious I can do / check, or is it back to the drawing开发者_StackOverflow社区 board on the design front - any comments?

thanks