How to have a movie unload automatically when it is done playing

1

hi all

I have used the following script to load a movie

but.onPress = function () {
_root.createEmptyMovieClip(“container”, 1);
loadMovie(“scene_1.swf”, “container”);
container._x = 150 ;
container._y = 20 ;
}

this works great, but now when the movie scene_1.swf is finished playing I would like the movie to unload automatically and return to the mainstage and continue the scene on the mainstage

is this possible?

thanks in advance
toddot