Load external movies seamless

Hi, can anyone help please, This is probably a dumb question to regular flash users. I want to be able to load a movies, wait till it finishes, unload that movie and then load a new movie. Kinda like a slideshow using external movies. My problem is understanding how to determine when a loaded movie has reached its last frame. Please. help.

I currently have this action on at the end of every movie, but it pops or gives a white flash in between movies which is not so smooth.

movie1: loadMovieNum("/media/flash/one.swf",0);

movie2: loadMovieNum("/media/flash/two.swf",0);

movie3: loadMovieNum("/media/flash/three.swf",0);

thank you