Web page looks drastically different on Macs

[ocampo]

I recently created a website using dreamweaver
on a pc. I have now uploaded the site to our
server and it comes up correctly on pcs, but on
Macintosh computers it comes up with a lot of empty
space (several inches) to the right of the main
info on the page. I hope this makes sense. If you
have a Mac and would like to check it, the address
is:

http://www.arthritis.arizona.edu

Thanks-JP