Unload with alpha transition using as

1

gary_btn.onRelease = function(){
imageLoader.content._visible = false;
nailLoader.content.unloadMovie();
empty_mc.unloadMovie();

for the either of the following unload lines (or perhaps the above .visable=false)
is there a way to actionscript so that the movie (swf),
unloads with a transition from 100 alpha to 0 alpha, (opaque to transparent)
and therefore create a smooth transition out, as opposed to a rapid disappear?
perhaps a 1/2 or 2/3 of a second or 15-20 frames at 30 fps?

nailLoader.content.unloadMovie();
empty_mc.unloadMovie();

thanks in advance