Load external pictures without interfering in the work the user is doing

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Flash

Flex

I want to load external pictures (that will end up changing periodically) without interfering with the end-user's work in Adobe Flash. What I want would be similar to Multi-Threading technology in the Programming Languages.
I am using the following code for load external pictures:

private var ldrExternalPreloader:Loader;
private var pictureHolderMovieClip:MovieClip;
private var showPreloader:Boolean;
private var preloaderMovieClip:MovieClip;
private var progressIndicator:TextField;

public final function Preloader(strFilePathName:String, mcPictureHolder:MovieClip, bolPreloader:Boolean = true, mcPreloader:MovieClip = null, txtDynProgressIndicator:TextField = null):void 
{
    ldrExternalPreloader = new Loader();
    ldrExternalPreloader.load(new URLRequest(strFilePathName));

    filePathName = strFilePathName;
    fictureHolderMovieClip = mcPictureHolder;
    showPreloader = bolPreloader;
    preloaderMovieClip = mcPreloader;
    progressIndicator = txtDynProgressIndicator;

    if (bolPreloader)
    {
        if (mcPreloader != null)
        {
            mcPreloader.visible = true;
        }
        trace("*************************" + " External Preloader Informtion " + "*************************");
        ldrExternalPreloader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, ldrExternalPreloader_Progress);
        trace("**************************************************");
    }
    ldrExternalPreloader.contentLoaderInfo.addEventListener(Event.COMPLETE, ldrExternalPreloader_Complete);
}

private function ldrExternalPreloader_Progress(progEvent:ProgressEvent):void 
{
    var numProgressCompletePercent:Number = Math.floor((progEvent.bytesLoaded * 100) / progEvent.bytesTotal);

    if (progressIndicator != null)
    {
        progressIndicator.text = numProgressCompletePercent + "%";
    }

    if(preloaderMovieClip is MovieClip && preloaderMovieClip != null)
    {
        preloaderMovieClip.gotoAndStop(numProgressCompletePercent);
    }
    trace("Progress Completed (%): " + numProgressCompletePercent + "%");
    trace(progEvent.bytesLoaded + " Bytes of " + progEvent.bytesTotal + " is Loaded.");
}

private function ldrExternalPreloader_Complete(event:Event):void 
{
    pictureHolderMovieClip.addChild(ldrExternalPreloader);

    if (showPreloader)
    {
        if (preloaderMovieClip != null)
        {
            preloaderMovieClip.visible = false;
        }
        ldrExternalPreloader.removeEventListener(ProgressEvent.PROGRESS, ldrExternalPreloader_Progress);
    }
    ldrExternalPreloader.removeEventListener(Event.COMPLETE, ldrExternalPreloader_Complete);
}

And I use it with the following line of code:

Preloader("Images/Previews/PC.png", mcContents.mcTransition.mcTransitionAni.mcLeftPreviews, true, mcPreloader, mcPreloader.txtDynProgressIndicator);

I only want to know if loading external pictures with this method interferes in the GUI/UI that the user is working in while in Adobe Flash Player or Adobe AIR, or not?