Unloading Multiple MC's in AS2

AS2. So I have several buttons that load external swfs into their own movie clips, but each movie clip needs to close before the next one is loaded. When I tried doing this:

on (release)
{
fnShowTab(4);
unloadMovie("emptymc", "mcprint");
}

It just says 'Wrong number of parameters; unloadMovie requires exactly 1'

Is there a way around this?

Thanks!

where emptymc is the instance name of the movieclip -

emptymc.unloadMovie();