Make Back button in Movie Clip ?

  public class Main extends MovieClip

    {

        var hp:HomePage;

        var sp:StartPage;

        var sunP:SunPage ;

        var jupiterP:JupiterPage;

        var vx:Number;

        var vy:Number;

        var speed:int;

        var score:Number;

        var aship:Ship = new Ship();

        var s1:Sun = new Sun();

        var j1:Jupiter = new Jupiter ();

        public function Main()

        {

             sp = new StartPage();

             hp = new HomePage();

             sunP = new SunPage();

             jupiterP = new JupiterPage();

            vx = 0;

            vy = 0;

            score = 0;

            addEventListener(KeyboardEvent.KEY_UP, onKeyUp);

            addEventListener(Event.ENTER_FRAME, onEnterFrameSun);

            addEventListener(Event.ENTER_FRAME, onEnterFrameJupiter);

            // Start Page Event Listener

            sp.sb.addEventListener(MouseEvent.CLICK, onStartButtonClick);

            addEventListener(MouseEvent.CLICK, onStartButtonClick);

            stage.addEventListener(KeyboardEvent.KEY_DOWN, keyHit);

            addChild (sp); 

            jupiterP.bb.addEventListener(MouseEvent.CLICK, onBackButtonClickJupiter);

            jupiterP.jupiterback.addEventListener(MouseEvent.CLICK, onBackButtonClickJupiter);

            addEventListener(MouseEvent.CLICK, onBackButtonClickJupiter);

        }

        function onBackButtonClickJupiter(event:MouseEvent):void

        {

            if (jupiterP != null && contains(jupiterP)) {

                removeChild(this.sp.homePage.jupiterP);

                addChild(hp);

            }

// Ive tried this method too but doesnt work

function onBackButtonClick_Jupiter(event:MouseEvent):void

        {

            addChild(hp);

            removeChild(jupiterP);

        }