The Validator shows quite a few problems with your code including tag mismatch some of which might affect the way IE renders your content. The difficult part for me is that finding those errors in your code which is very dense, would take ages. You might like to work through the validator's output bit-by-bit or maybe, wait for an expert to put their finger on the problem.
why do you use to two different menu bars? You could implant the other MenuBar Items so too in a single menu bar.