Ok, I've created an XHTML/CSS site that looks fine in IE5+, Mozilla, FireFox and Netscape.
It almost works a Mac but it seems something slightly is going wrong, so I've been told.
The biggest problem is on the Mac, while the page looks fine, for some reason part of the left column div goes over to the right, making the right colum div drop down below until the left hand content has been displayed. I am sure it is just a CSS problem with the position or maybe float but if I could get someone to pin point the problem it would save me a lot of time. I think I have given everything a width value so I am not sure why this is happening.
Also on the Mac and in Opera, my columns have a gap at the very bottom of the page somehow, not quite sure why? They seem fine in the other browsers.