[HELP] Centering External SWF

Question

I've read dozens of post on this forum as to how to do this, But I cannot get my own to work. I am loading an external swf file into an empty movieclip. I would like the external swf to be centered initially, and after page resize. Can someone PLZ assist me with this!!????
import flash.ui.Mouse;
import flash.events.Event;
import caurina.transitions.Tweener;
import gs.TweenLite;
import gs.*;
import gs.easing.*;
import net.stevensacks.preloaders.CircleSlicePreloader;  //Steven Sacks preloader
var preloader:CircleSlicePreloader = new CircleSlicePreloader(); //Steven Sacks preloader
//////////////////// STAGE ALIGN ALL MC /////////////////////
stage.align = StageAlign.TOP_LEFT;     
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.addEventListener(Event.RESIZE, onResize);
function onResize (evt:Event = null) {
downbg_mc.x = 0;
downbg_mc.y = stage.stageHeight;
downbg_mc.width = stage.stageWidth;
copyright_mc.x = stage.stageWidth/2;
copyright_mc.y = stage.stageHeight - downbg_mc.height/2 + copyright_mc.height/2;
preloader.x = stage.stageWidth * 0.5;
preloader.y = stage.stageHeight * 0.5;
loaderMC.x = (stage.stageWidth - loaderMC.width) * 0.5;
loaderMC.y = (stage.stageHeight - loaderMC.height) * 0.5;
backgroundMC.x = 0;
backgroundMC.y = 0;
backgroundMC.width = stage.stageWidth;
backgroundMC.height = stage.stageHeight;
btn1_mc.y = btn2_mc.y = btn3_mc.y = btn4_mc.y = 7;
}  // END onResize
onResize(new Event(Event.RESIZE));
///////////////// END stage align ////////////////////
addChild(loaderMC);
function onComplete(event:Event):void {
   if(contains(preloader))removeChild(preloader);          
            TweenLite.to(loaderMC, 1.5, {alpha:1.0, delay:0.0, onCompleteParams:[1.0, loaderMC]});
        loaderMC.x = (stage.stageWidth - loaderMC.content.width) * 0.5;
            loaderMC.y = (stage.stageHeight - loaderMC.content.height) * 0.5;
   addChild(downbg_mc);
   addChild(copyright_mc);
   addChild(btn1_mc);
   addChild(btn2_mc);
   addChild(btn3_mc);
   addChild(btn4_mc);
   addChild(scroller);
   addChild(backgroundMC);
} // END onComplete

Answer 1

what's loaderMC?  and TweenLite isn't going to do anything with those oncompleteparams because there's no oncomplete function.