Loading a video file from within a loaded movie

I’ve set up a test file and I’m having problems loading a video file from within a loaded movie.

I have 3 files - “base.swf”. This loads a swf - “LoadVideo.swf” into level 10

loadMovieNum("Files/videoFiles/LoadVideo.swf",10);

This, (“LoadVideo.swf”), has a button with the code

loadVideo_mc.onRelease = function() {
	loader_mc.loadMovie("Video.swf");
}

This third file - “Video.swf” is called from “loadVideo.swf” above and lives in the same folder.

If I just run, “loadVideo.swf”, the video runs OK. However, if I load it from within “base.swf” as above, it doesn’t work.

Any help would be much appreciated.