Re: Tab menu problem 
Try using the float option for the css.. 
Maybe that would work 
And I noticed that when I do divs as well, you should use advanced selectors.. 
But, I noticed that same crap happening when I open up work in chrome or something like that. 
Dont know what the problem is, but I would just put some text at the top or the bottom of the page saying best viewed in whatever browser you think it looks best in.