Triple booting help.

So, I have the first generation of intel iMacs. Back then, I knew very little about computers. To be honest, I still know very little, but am too proud to admit it. I had my friend lend me Windows XP and help me set up Boot camp back when it first came out. Now, I'm trying to set up Ubuntu on my same computer because I really like what I see with it and I want to try it for myself. Using my already partitioned hard drive is it possible to triple boot in a safe way. Mind you my computer has 1.83 GHz and only 1GB RAM. Any ideas? Thanks.

This subject has been discussed a number of times. You should be able to find several good threads regarding triple booting OS X, Windows, and Ubuntu. The key to successful triple booting is the use of a EFI boot manager: rEFiT

http://refit.sourceforge.net/

BTW, it's free.

Regards.