I found out how to pause movies at their ending and then trigger some other action using JavaScript
if (((myMovie.status == STARTED) && (myMovie._movie.currentTime >= (myMovie._movie.duration - 0.1)))) {
myMovie.pause();
myClock = new util.Clock;
}
if ((myMovie.status == FINISHED)) {
if ((myClock.getTime() >= 1.0)) {
myImage.opacity = 1;
}
}