Is this the best way to write this in AS3

Question

I have converted my old AS2 to As3. It now appears to work the same as before but being new to AS3 I have a few questions.
In this example I click on a button which takes me to a keyframe that plays a MC. There is another btn that takes me back to the original page.
In AS2 it is written like this.
// Go to keyFrame btn
on (release) {
//Movieclip GotoAndStop Behavior
this.gotoAndStop("Jpn_Scul_mc");
//End Behavior
// Play Movie
on (release) {
//Movieclip GotoAndStop Behavior
this.gotoAndStop("Jpn_Movie");
//End Behavior
//load Movie Behavior
if(this.mcContentHolder == Number(this.mcContentHolder)){
loadMovieNum("PL_Japan_Scul.swf",this.mcContentHolder);
} else {
this.mcContentHolder.loadMovie("PL_Japan_Scul.swf");
//End Behavior
// Return key
on (release) {
//Movieclip GotoAndStop Behavior
this.gotoAndStop("Jpn_Intro");
//End Behavior
In AS3 it is written like this.
// Play Movie
var myrequest_Jpn:URLRequest=new URLRequest("PL_Japan_Scul.swf");
var myloader_Jpn:Loader=new Loader();
myloader_Jpn.load(myrequest_Jpn);
function movieLoaded_Jpn(myevent_Jpn:Event):void {
stage.addChild(myloader_Jpn);
var mycontent:MovieClip=myevent_Jpn.target.content;
mycontent.x=20;
mycontent.y=20;
//unload method - Return to keyframe
function Rtn_Jpn_Intro_(e:Event):void {
gotoAndStop("Japan_Intro");
Rtn_Jpn_Intro_btn.addEventListener(MouseEvent.CLICK, removeMovie_Jpn);
function removeMovie_Jpn(myevent_Jpn:MouseEvent):void {
myloader_Jpn.unload();
myloader_Jpn.contentLoaderInfo.addEventListener(Event.COMPLETE, movieLoaded_Jpn);
Rtn_Jpn_Intro_btn.addEventListener("click",Rtn_Jpn_Intro_);
// Go to keyFrame btn
function Scul_Play(e:Event):void {
gotoAndStop("Jpn_Scul_mc");
Jpn_Scul_btn.addEventListener("click",Scul_Play);
1. Is there a better, more efficient way to achieve this in AS3?
2. I have used an //unload method in the AS3 script which does remove the MC from the scene but I notice in the output tab my variable code is still being counted for the last MC played.
Is this normal?

Answer 1

Hi Andrei, I have started a new project and taken your advice to construct it with a different architecture with all the code in one place.
I have two questions regarding your last code update.
var myrequest_Jpn:URLRequest;
var myloader_Jpn:Loader;
Rtn_Jpn_Intro_btn.addEventListener(MouseEvent.CLICK, removeMovie_Jpn);
Jpn_Scul_btn.addEventListener(MouseEvent.CLICK, Scul_Play);
function Scul_Play(e:MouseEvent):void {
     myrequest_Jpn = new URLRequest("PL_Japan_Scul.swf");
     myloader_Jpn = new Loader();
     myloader_Jpn.contentLoaderInfo.addEventListener(Event.COMPLETE, movieLoaded_Jpn);
     myloader_Jpn.load(myrequest_Jpn);
function movieLoaded_Jpn(e:Event):void {
     // remove listener
     myevent_Jpn.target.removeEventListener(Event.COMPLETE, movieLoaded_Jpn);
     this.addChild(myloader_Jpn);
     myloader_Jpn.x = 20;
     myloader_Jpn.y = 20;
     // remove objects that are in "Japan_Intro" frame
function removeMovie_Jpn(e:MouseEvent):void {
     // add back objects that are in "Japan_Intro" frame
     // remove from display list
     this.removeChild(myloader_Jpn);
     myloader_Jpn.unload();
     myloader_Jpn = null;
     // this moved from Rtn_Jpn_Intro_ function
     //gotoAndStop("Japan_Intro");
Its all works great except for the line to remove event..
1.
myevent_Jpn.target.removeEventListener(Event.COMPLETE, movieLoaded_Jpn);
I get an error:   1120: Access of undefined property myevent_Jpn.
Removing this statement allows the code to work but that is not a solution.
2.
Rtn_Jpn_Intro_btn.addEventListener(MouseEvent.CLICK, removeMovie_Jpn);
I would like this button to remove more than one movie. Is this possible.
Thanks for the help todate.