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Well, altough you will get some great help by Mike atleast (and maybe Juztyn if he's not too busy), I suggest you go over to Massassi.net (http://www.massassi.net) and ask over there. They should know for sure. :D
I have yet to get into JO (especially since my computer is still hosed) but I can definately tell you where to go for all your JK and JO needs. www.massassi.net) has levels, mods, and editing help for both games.