Why does the content spill over and how do I position this under the menu and title?

programming flash
1

I was following this tutorial on how to add a scrolling image gallery to a Flash website.
(http://www.republicofcode.com/tutorials/flash/xmlimagegallery/index.php)

From what I understand from this tutorial, it is just a matter of copying the Actionscript code and pasting it onto the timelines then making modifications on the XML.
(kindly see a screenshot of timeline layers I made and as to where I put the Actionscript code:
http://i429.photobucket.com/albums/qq19/tsujzpie/imagegalleryproblem_01.jpg )

I pasted the code onto the blank keyframe labeled “Gallery”…

But all I get is this weird effect when I click on the button for the gallery…
(kindly see a screenshot of it here: http://i429.photobucket.com/albums/qq19/tsujzpie/imagegalleryproblem_02.jpg )

When you put a blank keyframe on a timeline, any content put in there is supposed to only be contained in that very frame, right? How come then that - whenever the gallery button is clicked on - the content from that section spills out onto the other sections even when I click on other button for the other areas?

I just really couldn’t think why this is happening - any reason why this is so?
And how do I position the gallery right under the section header and menu bar?

Here is its AS2 code, by the way:

   import mx.transitions.Tween;
    import mx.transitions.easing.*;
    
    var myGalleryXML = new XML();
    myGalleryXML.ignoreWhite = true;
    myGalleryXML.load("gallery.xml");
    
    myGalleryXML.onLoad = function() {
        _root.gallery_x = myGalleryXML.firstChild.attributes.gallery_x;
        _root.gallery_y = myGalleryXML.firstChild.attributes.gallery_y;
        _root.gallery_width = myGalleryXML.firstChild.attributes.gallery_width;
        _root.gallery_height = myGalleryXML.firstChild.attributes.gallery_height;
    
        _root.myImages = myGalleryXML.firstChild.childNodes;
        _root.myImagesTotal = myImages.length;
    
        _root.thumb_height = myGalleryXML.firstChild.attributes.thumb_height;
        _root.thumb_width = myGalleryXML.firstChild.attributes.thumb_width;
    
        _root.full_x = myGalleryXML.firstChild.attributes.full_x;
        _root.full_y = myGalleryXML.firstChild.attributes.full_y;
    
        callThumbs();
        createMask();
        scrolling();
    
    };
    
    function callThumbs() {
        _root.createEmptyMovieClip("container_mc",_root.getNextHighestDepth());
        container_mc._x = _root.gallery_x;
        container_mc._y = _root.gallery_y;
    
        var clipLoader = new MovieClipLoader();
        var preloader = new Object();
        clipLoader.addListener(preloader);
    
        for (i=0; i<myImagesTotal; i++) {
            thumbURL = myImages*.attributes.thumb_url;
            myThumb_mc = container_mc.createEmptyMovieClip(i,     container_mc.getNextHighestDepth());
            myThumb_mc._y = _root.thumb_height*i;
            clipLoader.loadClip("thumbs/"+thumbURL,myThumb_mc);
    
            preloader.onLoadStart = function(target) {
                target.createTextField("my_txt",target.getNextHighestDepth   &nbsp;(),0,0,100,20);
                target.my_txt.selectable = false;
            };
    
    
            preloader.onLoadProgress = function(target, loadedBytes, totalBytes) {
                target.my_txt.text = Math.floor((loadedBytes/totalBytes)*100);
            };
    
            preloader.onLoadComplete = function(target) {
                new Tween(target, "_alpha", Strong.easeOut, 0, 100, .5, true);
                target.my_txt.removeTextField();
                target.onRelease = function() {
                    callFullImage(this._name);
                };
    
                target.onRollOver = function() {
                    this._alpha = 50;
                };
    
                target.onRollOut = function() {
                    this._alpha = 100;
                };
            };
        }
    }
    
    function callFullImage(myNumber) {


        myURL = myImages[myNumber].attributes.full_url;
        myTitle = myImages[myNumber].attributes.title;
        _root.createEmptyMovieClip("fullImage_mc",_root.getNextHighestDepth());
        fullImage_mc._x = _root.full_x;
        fullImage_mc._y = _root.full_y;
    
        var fullClipLoader = new MovieClipLoader();
        var fullPreloader = new Object();
        fullClipLoader.addListener(fullPreloader);
    
        fullPreloader.onLoadStart = function(target) {
            target.createTextField("my_txt",fullImage_mc.getNextHighestDepth   &nbsp;(),0,0,200,20);
            target.my_txt.selectable = false;
        };
    
        fullPreloader.onLoadProgress = function(target, loadedBytes, totalBytes) {
            target.my_txt.text = Math.floor((loadedBytes/totalBytes)*100);
        };
    
        fullPreloader.onLoadComplete = function(target) {
            new Tween(target, "_alpha", Strong.easeOut, 0, 100, .5, true);
            target.my_txt.text = myTitle;
        };
    
        fullClipLoader.loadClip("full_images/"+myURL,fullImage_mc);
    }
    
    function createMask() {
    
        _root.createEmptyMovieClip("mask_mc",_root.getNextHighestDepth());
    
        mask_mc._x = _root.gallery_x;
        mask_mc._y = _root.gallery_y;
    
        mask_mc.beginFill(0x000000,100);
        mask_mc.lineTo(_root.gallery_width,0);
        mask_mc.lineTo(_root.gallery_width,_root.gallery_height);
        mask_mc.lineTo(0,_root.gallery_height);
        mask_mc.lineTo(0,0);
    
        container_mc.setMask(mask_mc);
    
    }
    
    function scrolling() {
        _root.onEnterFrame = function() {
    
            container_mc._y += Math.cos(((mask_mc._ymouse)/mask_mc._height)    *Math.PI)*15;
    
            if (container_mc._y>mask_mc._y) {
                container_mc._y = mask_mc._y;
            }
    
            if (container_mc._y<(mask_mc._y-(container_mc._height-mask_mc.    _height))) {
                container_mc._y = mask_mc._y-(container_mc._height-    mask_mc._height);
            }
    
        };
    }