How to control external loaded movie?

Hello
I have a main swf and inside that swf i have loaded a external swf with a video.
Now i want to control the swf with the video but from buttons located on the main swf…
how can i do that? what will be the target to the external movie?

I have loaded this external movie with this command:

 
//load Movie Behavior
if(_root.anuncio.videomc.video == Number(_root.anuncio.videomc.video)){
loadMovieNum("video.swf",_root.anuncio.videomc.video);
} else {
_root.anuncio.videomc.video.loadMovie("video.swf");
}
//End Behavior