You have stumbled across one of the biggest complaints (that I've heard anyway) in the difference between IE and Mozilla. Mozilla adheres more closely to W3C standards...Micro$oft does their own thing. Yes, it makes designing sites rather difficult. I normally design for Mozilla and make slight modifications to ensure it looks reasonably close in IE. (I do go back and forth between the two quite a bit!) If you look closely, you'll find out that your web page cannot be an exact duplicate, but with a little tweaking, you'll get it awfully darn close.