For what it's worth, I did not want to leave IE6 either, but I have, and I am happier with IE 7 than I was with IE 6. 7 is free, too, from Microsoft's website, if that was the issue. If not, then please ignore me; I am not a computer guy at all.
Firefox has all the tabbing options you could want- I was using IE 7 until Firefox 1.5 was released - now using 2.0 - Great browser, much safer than IE 6 - even IE 7 is better than 6 and has tabbing