Actionscript 2.0 :: Moving A Movie Clip Outside The Stage?

I want to make a movie clip move anywhere outside the stage, but dont really know how should I do it, here is the codeI think that some changes should be made somewhere around math.random, where I put that // ???btw, I got this code from a tutorial where it was about attaching like 50 balls at once, making them move to random locations so there might be some useles things too the point is that I want a ball to be attached somewhere, preferably to the middle of the stage, and I want it to move in random direction with constant speed. I tried many ways of doing it, but the ball was changing direction every frame or other lame things happened