Where to add new script in an ActionScript file

Question

Hi,
moved to AS3 forum
I am a newbie using Flash Pro CS5 and have beginner skills in AS3.
I am working on an eLearning lesson and already, with a lot of earlier help of others, and have an Action Script file to use for a white noise  animation in a learning lesson.
I need to make a couple of additions but am very unfamiliar with adding  script to an Action Script file "package." Specifically, I want to add a  URL checking to the Action Script file so that students do not view the  Flash movie animation outside of the lesson which contains learning  materials and instructions for using the animation.
I would like to add the following script but so far, I have been getting error messages:
if ((this.loaderInfo.url).indexOf("mywebsite. com") == -1)
            navigateToURL (new URLRequest ("http://mywebsite.com/default.html"));
            else
//run the animation
The current AS3 in the .as file is:
package
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.events.TimerEvent;
    import flash.geom.Matrix;
    import flash.geom.Point;
    import flash.utils.getTimer;
    import flash.utils.Timer;
    public class Main extends Sprite
        private var viewbmd:BitmapData;
        private var workbmd:BitmapData;
        private var scaleUp:Matrix;
        private var px:Vector.<uint>;
        private var timer:Timer;
        private var itsNoisy:Boolean;
        public function Main():void
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        private function init(e:Event = null):void
            removeEventListener(Event.ADDED_TO_STAGE, init);
            viewbmd = new BitmapData(stage.stageWidth, stage.stageHeight, false);
            var view:Bitmap = new Bitmap(viewbmd);
            addChild(view);
            workbmd = new BitmapData(viewbmd.width / 8, viewbmd.height / 8, false);
            scaleUp = new Matrix();
            scaleUp.scale(8, 8);
            itsNoisy = true;
            stage.addEventListener(MouseEvent.CLICK, manageNoise);
            initNoise();
            timer = new Timer(50);
            timer.addEventListener(TimerEvent.TIMER, onTick);
            timer.start();
        private function initNoise():void {
            var array:Array = [];
            for (var i:uint = 0; i < 255; i++) {
                array[i] = 0xffffff * (i % 2);
            workbmd.noise(getTimer(), 0, 255, 7, true);
            workbmd.paletteMap(workbmd, workbmd.rect, new Point(0, 0), array, array, array);
            px = workbmd.getVector(workbmd.rect);
        private function onTick(e:Event):void {
            flipSomePixels(160);
            viewbmd.draw(workbmd, scaleUp);
        private function flipSomePixels(howMany:int):void {
            for (var i:int = 0; i < howMany; i++){
            var pxidx:int = Math.floor(Math.random()*px.length);
                px[pxidx] = ~px[pxidx]; //bitwise NOT to flip all bits
            workbmd.setVector(workbmd.rect, px);
        private function manageNoise(e:MouseEvent):void {
            itsNoisy ? timer.removeEventListener(TimerEvent.TIMER, onTick) : timer.addEventListener(TimerEvent.TIMER, onTick);
            itsNoisy = !itsNoisy;
If anyone can take a look and please let me know how to add the  additional script to check for the URL (please be specific since I am a beginner in  scripting):
I have tried everything that I can think of and am stuck.
Thanks in advance for your help.
Kind Regards,
saratogacoach

Answer 1

in your constructor:
if (this.loaderInfo.url.indexOf("mywebsite.com") == -1) {
    navigateToURL(new URLRequest ("http://mywebsite.com/default.html"));
} else {
    addEventListener(Event.ADDED_TO_STAGE, init);