Top Navigation cannot be viewed in IE9

Hi,

I am having a few issues with navigation on my site:
http://thecmbok.com/

Top Navigation is missing (not viewable) in IE9 (only the grey boxes show up).

Also, if I add a child page, the drop-down nav looks horrible in IE8 as well. It shrinks the main nav text down and the drop-down overlaps the main nav and shifts it to the right.

Your insight in resolving this issue would be much appreciated.