Both factions?

at the point in the factions game where you have to chose to help either the kurzicks or the luxons I chose to help the kurzicks. I beat a few of there quest and now i was just wondering if there is a way to go back and go with the luxons. if there is will you tell me how and where to do it? thanks

Actually, you won't be barred from doing any quest in the game at any time. Just go into Luxon Territory when you're ready and do their quests.

go back to matuu keep, talk to jamei again, and pick the quest "travel to cavalon" or some such, and talk to rhea, once you have more luxon faction than kursick faction, their traders/skill trainers/merchants will talk to you, if you have more kursick than luxon faction, you can still get the luxon quests to get the luxon faction.