WORKING scroller demo

        var vx:int = 0;

        var rightInnerBoundary:uint;
        var leftInnerBoundary:uint;

    if(!stage){
        this.addEventListener(Event.ADDED_TO_STAGE, stageReady);
    }else{
        stageReady();
    }


    function stageReady(event:Event = null):void {
    stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDownHandler);
    stage.addEventListener(KeyboardEvent.KEY_UP, keyUpHandler);
    stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);

             rightInnerBoundary
                = (stage.stageWidth /2) + (stage.stageWidth /4);
             leftInnerBoundary
                = (stage.stageWidth /2) - (stage.stageWidth /4);

}



                function keyDownHandler(event: KeyboardEvent): void
                    {

                    if (event.keyCode == Keyboard.LEFT)
                        {
                        vx = -5;
                        character.gotoAndPlay("WALKL");
                    } else if (event.keyCode == Keyboard.RIGHT)
                    {
                        vx = 5;
                        character.gotoAndPlay("WALKR");
                    }
                }
                function keyUpHandler(event: KeyboardEvent): void
                {

                     if (event.keyCode == Keyboard.LEFT)
                         {
                        vx = 0;
                        character.gotoAndStop("ILDEL");

                    } if (event.keyCode == Keyboard.RIGHT)
                    {
                        vx = 0;
                        character.gotoAndStop("ILDER");
                       }

                    }

                        function enterFrameHandler(event: Event): void {
                            {

                                character.x += vx

                                if (character.x < leftInnerBoundary)
                                    {
                                    character.x = leftInnerBoundary;
                                    rightInnerBoundary = (stage.stageWidth /2) + (stage.stageWidth /4)
                                    background.x -= vx /2;
                                    foreground.x -= vx;


                                } if (character.x + character.width > rightInnerBoundary)
                                {
                                    character.x = rightInnerBoundary - character.width
                                    leftInnerBoundary = (stage.stageWidth /2) - (stage.stageWidth /4)
                                    background.x -= vx /2;
                                    foreground.x -= vx;

                                    if (foreground.x > 0)

                                    {
                                        foreground.x = 0;
                                        background.x
                                         = -(background.width - stage.stageWidth) /4;
                                        leftInnerBoundary = 0;

                                    }

                                    if (foreground.x < stage.stageWidth - foreground.width)

                                    {
                                        foreground.x = stage.stageWidth - foreground.width;
                                        background.x
                                         = ((background.width - stage.stageWidth) /4) * -3;
                                        rightInnerBoundary = stage.stageWidth;
                                    }
                                }

                            }
                        }

http://sta.sh/01ksyfdtbwg