Telling loaded movie to play();

should be simple…but again i am lost. Heres the scenario…

I have a main movie(main.swf). I’ve loaded a movie into it(loaded.swf). I need the loaded movie to finish playing once a button is clicked in the main.swf. So basically i need something like

when a button in the main.swf is pressed, finish playing “loaded.swf”

that make sense?