unloadClip

what would make unloadClip return a false value ?

i am currently working on a site that loads it’s intro (intro.swf) with loadClip…


myCargador.loadClip("intro.swf", introHolder);

up to that point…all is good …
i want to remove the intro.swf when the user clicks on a button, so… i do this…

myCargador.unloadClip(target_mc);

problem is,…intro is not being unloaded…

i also have this trace in there

trace("intro unloaded?:" + myCargador.unloadClip(target_mc));

which gives me ‘false’

so…what makes unloadClip return a false value?