closing a movie clip with a mouse click?

[good_snow]

I have a button that loads a movie clip and I want to be able to close that same movieclip by clicking anywhere.

This is my code so far:

btn_2.addEventListener(MouseEvent.CLICK, goBio);
function goBio (e:MouseEvent):void {
var newBio:BioToc = new BioToc();
this.addChild(newBio);
newBio.x = 25;
newBio.y = 45;
}