After I select a movie from a button, how do I make the movie invisible after it plays?

I'm making a GUI that has three buttons on the stage.  The buttons may be selected at random.  Each button activates a short animation (movie clip).  The movie takes up the entire stage.  After the clip plays, I want it to disappear from the stage, allowing the user to select any other (or the same) button/movie clip.  So far I have this script.  There are no compiler errors nor any syntax errors.  However, it still dosn't do what I want.  What am I missing?  Thanks

movieOne_btn.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);

function mouseDownHandler(event:MouseEvent):void
{
navigateTo.MovieOne.mc;
gotoAndPlay(1);
}
if (MovieOne.mc.complete)
{
gotoAndStop(15);
}

loader.contentLoaderInfo.addEventListener(Event.COMPLETE, swfIn);
function swfIn(e:Event):void
{
loader.contentLoaderInfo.removeEventListener(Event.COMPLETE, swfIn);
mcExternal = loader.content = MovieClip;

MovieOne.mc.visible = false;
}