Easy question about loading a movie

1

this is used to load a movie on an event right:

contactb.onPress = function () {
_root.createEmptyMovieClip(“contact”, 1);
loadMovie(“contact.swf”, “contact”);
container._x = 0 ;
container._y = 0 ;
}

what if I want to load a movie simply at a certain point in the movie, ie a keyframe, what is the code applied to the keyframe and why/how is it different?

thanks!