Closing a movie clip with EventListener with a mouse click

Question

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;

Answer 1

If I remove var from this line var newBio = new BioToc(); then it stops working all together. So I'm not sure what you mean by just changing it to newBio = new BioToc();
I'm not sure what you mean by changing goBio, can I just put any word in front of Bio to change it?
This is what I did and now I get an error that says "Scene 1, Layer 'actions', Frame 1, Line 10. 1084: Syntax error: expecting leftparen before this.
btn_2.addEventListener(MouseEvent.CLICK, goBio);
function goBio (e:MouseEvent):void {
var newBio = new BioToc();
this.addChild(newBio);
newBio.x = 25;
newBio.y = 45;
stage.addEventListener(MouseEvent.MOUSE_UP, removeBio);
function removeBio this.removeChild(newBio);
var newBio = new BioToc();
newBio.x = 25;
newBio.y = 45;