Thanks alot brokenpoly!
Yes u are right for a simple swinging door it is the best way to do the animation within the unreal editor. the door i want to use is a si-fi vault door with 20 different parts, bolts locks and stuff. it is just so much easier to animate stuff like that in a different animation package.
so is there an other way to reverse a door FBX animation?
BTW: nice jesus 