I need a global var?

Hello again, i have this code.

import flash.display.*;
import flash.events.*;
import flash.utils.*;
import flash.display.Loader;
import flash.display.MovieClip;
import flash.display.LoaderInfo;
import flash.net.URLRequest;
import flash.text.TextField;
import flash.events.Event;
import flash.events.ProgressEvent;
import caurina.transitions.Tweener;
import flash.display.MovieClip;
import flash.display.StageAlign;
import flash.display.StageScaleMode;

stage.align=StageAlign.TOP_LEFT;
stage.scaleMode=StageScaleMode.NO_SCALE;
stage.addEventListener(Event.RESIZE, resizeHandler);
addEventListener(Event.ENTER_FRAME, resizeHandler);
var aCarregar:Loader = new Loader();
carregarSwf("count");

function resizeHandler(event:Event):void {
 
 preloaderBarra.x = (stage.stageWidth/2);
 preloaderBase.x = (stage.stageWidth/2);
 preloaderLogo.x = (stage.stageWidth/2);
 menuTopo.x = (stage.stageWidth)/2;
 footerTexto.x = (stage.stageWidth)/2;
 footer.width=(stage.stageWidth);
 footer.align=StageAlign.LEFT;
 var externalMovie = MovieClip (aCarregar.content);
 trace("externalMovie "+externalMovie);
 if (externalMovie!=null){
  trace("nao ha")
  }
  else{
   externalMovie.centro.x=(stage.stageWidth/2);
   }
}
function carregarSwf(teste:String) {
 var swfACarregar:String=teste;
 var swfQueCarrega:URLRequest = new URLRequest(swfACarregar+".swf");
 preloaderBarra.alpha=0;
 preloaderBase.alpha=0;
 preloaderLogo.alpha=0;
 menuTopo.y=menuTopo.y-70;
 aCarregar.load(swfQueCarrega);
 aCarregar.contentLoaderInfo.addEventListener(Event.OPEN,showPreloader);
 aCarregar.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS,showProgress);
 
 
}
function showPreloader(evt:Event):void {

 Tweener.addTween(preloaderLogo, {alpha:1, time:0.5, transition:"easeOutBounce"});
 
}
function showProgress(evt:ProgressEvent):void {
 var numero:uint = (evt.bytesLoaded/evt.bytesTotal)*100;
 preloaderBarra.width = (numero*1.55);
}
function showLoadResult(evt:Event):void {
 preloaderLogo.visible=false;
 preloaderBase.visible=false;
 preloaderBarra.visible=false;
 var externalMovie = MovieClip (aCarregar.content);
 stage.addChildAt(externalMovie,0);
 
}

How can i resize the extenalMovie, i cant call function resizeHandler with externalMovie inside, can someone help me?

Sorry de bad english