I was using an external style sheet on my site, but then I had a few complaints from some people that are on MAC computers that the website was looking all weird, and didn't look right. They even sent me some screenshots of what it looked like and it was really weird. I use IE6 and it looked fine, but I'm wondering why it didn't look right on the MAC computers? Is it not compatible with MACs?

Which browser did they use? Internet Explorer or Netscape Navigator? In alot of versions of Netscape, CSS is not compatible. It also isn't compatible in Internet Explorers which haven't upgraded to at least version 5.5 . Hope that helps!

Maybe this will help?
http://hotwired.lycos.com/webmonkey/reference/browser_chart/index_mac.html