Mouse drag only on x Axis

Okay I got a ball that every time I tab on it, it creates another ball. right? OK now the problem I have is that when I have MouseButtonDown--->FollowMouse---->X, Axis, then MouseButtonUp---->FollowMouse---->None, my original ball moves away from my cruiser i mean my mouse pointer and then it creates the ball, any suggestions how to solve this?