Backward on button

programming flash
1

Anyone, help me…
How I create a backward event, this event will have the following tasks:

  1. When I ‘over’ (place my pointer) to the button, a light is appearing, and it’s moving from left to right.
  2. But when I move my pointer away from the button (the pointer is not on the button), the light is moving backward (from the last position it reached in first task).
    TQ…