http://funnyguys99.tripod.com/index.htm

This is just the basic layout, and has been only tested in IE 6 and Netscape 7. It's my first site using css layouting, so please tell me what you think of it. If there are any problems, please tell me and include what browser you are using, thanks!

I see nothing really wrong with the design. Except shouldn't "Your Add Here" be "Your Ad Here"

That being said, I have some suggestions.
1. You menu is a bunch of anchor tags. You should consider using a unordered list for them. It is more symatically correct way of doing things.
2. I prefer to put my content as close to the top in the source code as possible. I realize there is a lot of tripod junk that is beyond your control, but your "mainbody" comes after the "rightbar". Some search engines rank content based on where it falls in the document.
3. Finally, I would strongly encourage you to put the CSS in an external file.

Hope that gives you something to think about. Good luck with the site.