Buttons are messing up?

Hi guys,

I am having trouble with unload an loading movies. Basically I am loading a movie into a container, which works a charm:

graphicsbut.onRelease = function() {

_root.createEmptyMovieClip("container",1);
loadMovie("Graphics/Graphics.swf","container");
container._x = -22 ;
container._y = 0 ;

}

And then I want to load another movie above this one, also working:
Dyson_hit.onRelease = function()
{
Dyson_mc.gotoAndPlay(“out”);
loadMovieNum(“Graphics/Catwalks.swf”, 2);
disableBtns();
}

But NOW the problem…I want to unload them both when a close button is pressed?
Ideally I would like to add that second movie clip into a container so I can position it correctly, but when I try copying the code I use on the first it doesn’t seem to work…is it to do with the “root” bit perhaps?