Preloader and loading MovieClips Question

Question

I've been making seperate files for each of my pages which are around a megabyte in size for my webpage, and I was wondering is there a way to make a preloader all in one file, and when it loads the page it goes straight to the preloader instead of the screen going white for a few seconds while it loads? If so I played around with it and lemme know what's wrong with the code:
I added this section of the code before all the vars for the actual site, but it still didn't work the way I wanted it to
import com.greensock.TweenLite;
import com.greensock.easing.*;
var scrollTimer:Timer = new Timer(2000,1);
scrollTimer.addEventListener("timer",scrollShow);
this.addEventListener(Event.ENTER_FRAME,myProgress);
scrollGallery_mc.alpha = 0;
function scrollShow(e:TimerEvent):void {
     TweenLite.to(scrollGallery_mc,2,{alpha:1});
function myProgress(e:Event):void {
     var loaded:Number = this.stage.loaderInfo.bytesLoaded;
     var total:Number = this.stage.loaderInfo.bytesTotal;
     var pct:Number = loaded/total;
     load_mc.loader_mc.scaleX = pct;
     preload_txt.text = "Loading: " + (Math.round(pct*100)) + "%";
     if (pct == 1) {
          myComplete();
function myComplete():void {
     startPage();
     this.removeEventListener(ProgressEvent.PROGRESS,myProgress);
     this.removeEventListener(Event.COMPLETE,myComplete);
     load_mc.visible = false;
     preload_txt.visible = false;
     scrollTimer.start();
     play();
stop();
Second question is there a way to load a movie clip object using as3 as an a separate interactive object without directly adding it to the stage in the fla file?

Answer 1

It's a stupid simple intro clip with no depencies to the application. The crazy thing about is, that it's loads the most time... So i think i make something wrong? I start loading after the preloader was added to stage.