Control movie's lenght at run time (2 instance of a movie)

Hi,


there is a movie which moves a box from a position to another position. I created its two instances and put the both on main time line, each horizontally (both INSTANCES besides eachother). This casue different x-position in instance position.

when i click a button to start playing these instance than first instance is played and BOX move to a position. When i play the second instance BOX moves to a position different than the position of 1st INSTANCE (Where first instance movie stopped). This difference was because of different X-POSITION of movie instances on TIME LINE.

Now i want both the instances to play and stop at same point (SAME x-position on MAIN TIMELINE)

THANX
SYED