Loading into Parent Container

programming flash
1

Late night dumb question time:

I have an SWF named “gallery.swf” that loads into an empty clip called “holder_mc” in the parent movie. How do I call a function from gallery.swf that replaces gallery.swf with a file called “purchase.swf” in holder_mc? The function I’m using looks like this:

function ProceedToCart():Void {
    _root.mcLoader.loadClip("purchase.swf",_root.holder_mc);
}