How to unload the external .swf file when move on to other section?

Question

Hi,
The following code provided by Mr. kglad works great in loading an external .swf file onto stage. Now, when I click on Contact (Button), the external .swf file to be removed completely. How to code on contact (Button) to work it out.
Gallery.addEventListener(MouseEvent.CLICK, GalleryClick);
function GalleryClick(e:Event):void{
if(currentClip != Gallery_mc){
currentClip.visible = false;
Gallery_mc.visible =true;
currentClip =Gallery_mc;}
var loader:Loader=new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, ClipLoaded);
loader.load(new URLRequest("Gallery.swf"));
function ClipLoaded(e:Event):void{
Gallery_mc.addChild(loader);
loader.x=0;
loader.y=120;
loader.width=1000;
loader.height=700
I tried the following code for Contact_btn to unload the Gallery.swf file which throws an error: 1120: Access of undefined property loader.
Contact.addEventListener(MouseEvent.CLICK, ContactClick);
function ContactClick(e:Event):void{
if(currentClip != Cotnact_mc){
currentClip.visible = false;
Cotnact_mc.visible =true;
currentClip = Cotnact_mc;
Gallery_mc.removeChild(loader);}}

Answer 1

like so:
Gallery.addEventListener(MouseEvent.CLICK, GalleryClick);
function GalleryClick(e:Event):void{
if(currentClip != Gallery_mc){
currentClip.visible = false;
Gallery_mc.visible =true;
currentClip =Gallery_mc;}
var loader:Loader=new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, ClipLoaded);
loader.load(new URLRequest("Gallery.swf"));
function ClipLoaded(e:Event):void{
loader.contentLoaderInfo.removeEventListener(Event.COMPLETE, ClipLoaded);
Gallery_mc.addChild(loader);
loader.x=0;
loader.y=120;
loader.width=1000;
loader.height=700
I tried the following code for Contact_btn to unload the Gallery.swf file which throws an error: 1120: Access of undefined property loader.
Contact.addEventListener(MouseEvent.CLICK, ContactClick);
function ContactClick(e:Event):void{
if(currentClip != Cotnact_mc){
currentClip.visible = false;
Cotnact_mc.visible =true;
currentClip = Cotnact_mc;
if(loader){
if(loader.stage){
gallery_mc.removeChild(loader);
loader.unloadAndStop();  // for fp 10+
loader=null;  // if loader no longer needed