Quest completion

I just recently started playing Guild Wars Factions.
I wanted to know if it was possible to have multiple quests active at the same time. Can I take on a quest in an area if I still have not completed the objectives of another quest. It seems like you lose your rewards if you try to do so. Just wondered if this was by design or if I am just being a fool
Thanks for any help you can offer

Take as many quests as you want, you can do them simultaneously ( sp? )

However, some quests will override other quests ( E.G. some Titan quests will no longer spawn the old creatures, thus rendering other quests useless)

Cool, I figured I may have just got meesed up
I think my problem was that I quick traveled back to a town before I completed all the quest objectives and had to redo the quest from the beginning.

That can definately happen. I like it when I have two or three quest objectives in one area and I can do them all at once. =)