Rollover scrolling menu - no buttons

Question

So below is my code for a project I'm working on. I'm having some trouble though. I got the code for the scrolling menus online from another forum, but I can't figure out where that was. In any case, the current version of the code allows for the scrolling to happen when I open the page displays (enter Frame). But I can't figure out how to get the scrolling to happen only when I hover over the menu. Can anyone help? I only want each one to scroll when I hover over the menu, not when I get on the page. I tried to replace the "enterFrame" part of the code, but it didn't work right. I need this done ASAP. Thanks in advanced!
import fl.transitions.Tween;
import fl.transitions.easing.*;
var mymovie = this;
var mymovieW = this.width;
var horizontalMode = 0;//1--horizontalMode; 0--verticalMode
var spaceImg = 7;//space beteen images
var fade = 0.5;
var containerPosition_x = 2;//put the container with images to the buttom of the stage
var containerPosition_y = 1;//put the container with images to the right of the stage
var yoffset = 10;//offset to adjust the position of big image on y axis
var xoffset = 10;
var numItems;
var objects;
var container:MovieClip = new MovieClip();
this.addChild(container);
var scrolling:Boolean = true;
var useFixedImageSize = 1;
var thumbnails:Array = new Array();
//load xml file
var xmlData = "Photoimages.xml";//set xml data file
var xmlObj:XMLDocument;
init();//init call -> load config XML and create objects
function init()
    xmlObj = new XMLDocument();
    xmlObj.ignoreWhite = true;
    var loader:URLLoader = new URLLoader();
    var request:URLRequest = new URLRequest(xmlData);
    loader.load(request);
    loader.addEventListener("complete", onComplete);
    loader.addEventListener("ioError", onIOError);
function onIOError(event:Event):void
    trace("IOERROR (maybe XML file does not exit or have an incorrect name)");
function onComplete(event:Event):void
    var loader:URLLoader = event.target as URLLoader;
    if (loader != null)
        xmlObj.parseXML(loader.data);
        xmlHandler();
    else
        trace("Loader is not a URLLoader!");
function xmlHandler()
    addObjects();
    startEngine();
function startEngine()
    container.addEventListener("enterFrame",startMovie);
function addObjects()
{//add objects in the scene
    objects = xmlObj.firstChild.childNodes;
    numItems = objects.length;
    for (var i=0; i<numItems; i++)
        var attr = objects[i].attributes;
        //Set the images
        thumbnails[i] = attr.thumb;
        init_thb(i);
function init_thb(i)
    if (useFixedImageSize == 1)
        var source1 = "AudioimgMc";//image mc linkage id from the library
    else
        source1 = "imgMc_01";
    var sourceType1 = "library";
    var regName1 = "p" + i;//the registration name used in Flash
    var classDef = getDefinitionByName(source1);
    var menuItemMc = new classDef  ;
    menuItemMc.name = regName1;
    container.addChild(menuItemMc);
    var myThumbMc = container.getChildByName(regName1);
    myThumbMc.buttonMode = true;
    myThumbMc.useHandCursor = true;
    myThumbMc.mouseChildren = false;
    myThumbMc["info"] = objects[i];
    myThumbMc.y = (myThumbMc.height+spaceImg)*(i);
    myThumbMc.x = (bkg.width-myThumbMc.width)/containerPosition_y;
    myThumbMc.alpha = fade;
    myThumbMc.addEventListener("mouseOver",mouseRollOver);
    myThumbMc.addEventListener("mouseOut",mouseRollOut);
    myThumbMc.addEventListener("mouseDown",mousePress);
function mouseRollOver(e:MouseEvent)
    e.target.alpha = 1;
function mouseRollOut(e:MouseEvent)
    e.target.alpha = fade;
function mousePress(e:MouseEvent)
    navigateToURL( new URLRequest( e.target["info"].attributes.url ), "_blank" );
function startMovie(e:Event)
    this.container.y += Math.cos((-stage.mouseY/stage.stageHeight)*Math.PI)*15;
        if (this.container.y > 0)
            this.container.y = 0;
        if (-this.container.y>(this.container.height-stage.stageHeight))
            this.container.y = -(this.container.height-stage.stageHeight);

Answer 1

I tried your solution but I got the following error.
ArgumentError: Error #1063: Argument count mismatch on Index_fla::AudiomovieClip_30/startEngine(). Expected 0, got 1.
Not sure why. Here is the updated code with your solution implemented. Thank you for helping me with this.
import fl.transitions.Tween;
import fl.transitions.easing.*;
var mymovie = this;
var mymovieW = this.width;
var spaceImg = 7;//space beteen images
var fade = 0.5;
var containerPosition_x = 2;//put the container with images to the buttom of the stage
var containerPosition_y = 1;//put the container with images to the right of the stage
var yoffset = 10;//offset to adjust the position of big image on y axis
var xoffset = 10;
var numItems;
var objects;
var container:MovieClip = new MovieClip();
this.addChild(container);
var scrolling:Boolean = true;
var useFixedImageSize = 1;
var thumbnails:Array = new Array();
//load xml file
var xmlData = "Audioimages.xml";//set xml data file
var xmlObj:XMLDocument;
init();//init call -> load config XML and create objects
function init()
    xmlObj = new XMLDocument();
    xmlObj.ignoreWhite = true;
    var loader:URLLoader = new URLLoader();
    var request:URLRequest = new URLRequest(xmlData);
    loader.load(request);
    loader.addEventListener("complete", onComplete);
    loader.addEventListener("ioError", onIOError);
function onIOError(event:Event):void
    trace("IOERROR (maybe XML file does not exit or have an incorrect name)");
function onComplete(event:Event):void
    var loader:URLLoader = event.target as URLLoader;
    if (loader != null)
        xmlObj.parseXML(loader.data);
        xmlHandler();
    else
        trace("Loader is not a URLLoader!");
function xmlHandler()
    addObjects();
    container.addEventListener(MouseEvent.MOUSE_OVER,startEngine,false,0, true);
function startEngine()
    container.removeEventListener(MouseEvent.MOUSE_OVER,startEngine);// cleanup;
    container.addEventListener("enterFrame",startMovie);
function addObjects()
{//add objects in the scene
    objects = xmlObj.firstChild.childNodes;
    numItems = objects.length;
    for (var i=0; i<numItems; i++)
        var attr = objects[i].attributes;
        //Set the images
        thumbnails[i] = attr.thumb;
        init_thb(i);
function init_thb(i)
    if (useFixedImageSize == 1)
        var source1 = "PhotoimgMc";//image mc linkage id from the library
    else
        source1 = "imgMc_01";
    var sourceType1 = "library";
    var regName1 = "p" + i;//the registration name used in Flash
    var classDef = getDefinitionByName(source1);
    var menuItemMc = new classDef  ;
    menuItemMc.name = regName1;
    container.addChild(menuItemMc);
    var myThumbMc = container.getChildByName(regName1);
    myThumbMc.buttonMode = true;
    myThumbMc.useHandCursor = true;
    myThumbMc.mouseChildren = false;
    myThumbMc["info"] = objects[i];
    myThumbMc.y = (myThumbMc.height+spaceImg)*(i);
    myThumbMc.x = (bkg.width-myThumbMc.width)/containerPosition_y;
    myThumbMc.alpha = fade;
    myThumbMc.addEventListener("mouseOver",mouseRollOver);
    myThumbMc.addEventListener("mouseOut",mouseRollOut);
    myThumbMc.addEventListener("mouseDown",mousePress);
function mouseRollOver(e:MouseEvent)
    e.target.alpha = 1;
function mouseRollOut(e:MouseEvent)
    e.target.alpha = fade;
function mousePress(e:MouseEvent)
    //enter video code here
function startMovie(e:Event)
    this.container.y += Math.cos((-stage.mouseY/stage.stageHeight)*Math.PI)*15;
    if (this.container.y > 0)
        this.container.y = 0;
    if (-this.container.y>(this.container.height-stage.stageHeight))
        this.container.y = -(this.container.height-stage.stageHeight);