unloadMovie()/loadMovie()

I have a page on my site that loads different flash movies ive made - http://www.pinchpile.com/flash/index.php. There should only be one link at the top. When a little square is clicked i call:
[AS]
_mc.unloadMovie();
_mc.loadMovie(path);
[/AS]
but if you click the link a bunch of times something funny happens - the squares start to come more and more. why?