Sure aimee, this page has a map:
http://www.dvdadept.com/DVD_Regions.asp
the various regions are colour coded. One thing to beware of; some more recent DVD releases include something called "RCE" (which i believe stands for Regional Coding Enhancement) which some multi-region players can't play. If you buy a multi-region player, and it can't cope with "RCE" discs, then you have to be careful which DVDs you buy. It should say on the case somewhere if it's an RCE disc, but i guess that's not much help if you're buying via the internet. Hope this is of some use to you. Cactus.