Xml gallery alignment, help

Question

I am making an XML gallery with thumbnails. It is working fine, but I have a problem with alignment of the images. All the large images are loading into the top left corner. I would like them to load with center alignment for all images. I don't know anything about Action Script. The way I made this website was to use already made sample of some one else. Can you help me to figure out this alignment problem? Again, I am very bad at Action Script, so it would be great if you can show me the actual coding for this to work.
Here is the sample gallery: http://www.chimeddorj.com
Here goes the Sript>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
RemoveAllThumbs.onLoad = function(){
removeAllThumbs()
//init global variables and properties
Stage.scaleMode = "noscale";
import gs.TweenFilterLite;
import gs.TweenLite;
XML LOADING
//handle loading of external images..
var slide:XML = new XML();
slide.ignoreWhite = true;
var largeImageUrl:Array = new Array();
var thumbUrl:Array = new Array();
var captions:Array = new Array();//not used
var p:Number = 0;//tracks position in arrays
/*!!!!if you want to load in another XML file, make sure you clear the existing thumbnails
by calling the removeAllThumbs() function first!*/
slide.onLoad = function() {
largeImageUrl = [];
thumbUrl = [];
captions =  [];
xmlNode = this.firstChild;
var images:Array = this.firstChild.childNodes;
for (i=0; i<images.length; i++) {
thumbUrl[i] = xmlNode.childNodes[i].childNodes[0].firstChild.nodeValue;
largeImageUrl[i] = xmlNode.childNodes[i].childNodes[1].firstChild.nodeValue;
captions[i] = xmlNode.childNodes[i].childNodes[2].firstChild.nodeValue;
p = 0;//reset p for different gallery loading
//create a bg clip for the thumbsTrack. Enables padding between images to work correctly
thumbMask_mc.thumbBox_mc.createEmptyMovieClip("thumbTrackBg",1);
thumbMask_mc.thumbBox_mc.thumbTrackBg.beginFill(0x000000,20);
thumbMask_mc.thumbBox_mc.thumbTrackBg.moveTo(thumbMask_mc.thumbBox_mc._x,thumbMask_mc.thum bBox_mc._y);
thumbMask_mc.thumbBox_mc.thumbTrackBg.lineTo(thumbMask_mc.thumbBox_mc._x+thumbMask_mc.thum bBox_mc._width,thumbMask_mc.thumbBox_mc._y);
thumbMask_mc.thumbBox_mc.thumbTrackBg.lineTo(thumbMask_mc.thumbBox_mc._x+thumbMask_mc.thum bBox_mc._width,thumbMask_mc.thumbBox_mc._y+thumbMask_mc.thumbBox_mc._height);
thumbMask_mc.thumbBox_mc.thumbTrackBg.lineTo(thumbMask_mc.thumbBox_mc._x,thumbMask_mc.thum bBox_mc._y+thumbMask_mc.thumbBox_mc._height);
thumbMask_mc.thumbBox_mc.thumbTrackBg.lineTo(thumbMask_mc.thumbBox_mc._x,thumbMask_mc.thum bBox_mc._y);
thumbMask_mc.thumbBox_mc.thumbTrackBg.endFill();
//load the thumbs
loadThumbs();
Mouse.removeListener(mouseListener);//kill the mouselistener if it is added
slide.load("paintings.xml");//load xml
var imageWidth:Number = 0;//default x position of our movieclips relative to containing movieclip
var buffer:Number = 20;//padding between images
var thumbsToShow:Number = 5//
LOAD THUMBNAILS, ADD ACTIONS & PADDING TO THUMBS
//here we load in our thumbnails
function loadThumbs() {
//remove the movieclip loade listener on each iteration of this function
Clip.removeListener(mclListener);
//attach and associate with a variable a MC to hold each loaded movieClip
var container:MovieClip = thumbMask_mc.thumbBox_mc.attachMovie("thumbBox", "thumbBox"+p, thumbMask_mc.thumbBox_mc.getNextHighestDepth(), {_x:imageWidth, _y:0});
//create a movieclip loader
var Clip:MovieClipLoader = new MovieClipLoader();
var mclListener:Object = new Object();
mclListener.onLoadStart = function(target_mc:MovieClip) {
target_mc._alpha = 0;//set thumb alpha to be zero
//handle loading progress - simple counter here
mclListener.onLoadProgress = function(target_mc:MovieClip, bytesLoaded:Number, bytesTotal:Number):Void  {
//use this if you want to indicate loading of your thumbnails etc...
//loadTxt.captions_txt.text = Math.floor(bytesLoaded/bytesTotal*100)+"%";
mclListener.onLoadInit = function(target_mc:MovieClip) {
//here we can access our loaded clips properties!
//here is where we attach functions to our clip so that we can dynamically create rollovers etc.
//make our thumbnails visible again
TweenLite.to(target_mc, 2, {_alpha:100});
//based off image width this places our thumbs next to each other
imageWidth = (imageWidth+target_mc._width)+buffer;
//associate a variable here with our p value, we use this later to load in large images
target_mc.pictureValue = p;
//handle  image rollovers these are active only on the thumb image!!! Watch the US spelling!
target_mc.onRollOver = function() {
TweenFilterLite.to(target_mc,.4,{type:"Color", brightness:1.5, ease:None.easeOut});
target_mc.onRollOut = function() {
TweenFilterLite.to(target_mc,4,{type:"Color", brightness:1, ease:None.easeOut});
//handle a click on a thumbnail
target_mc.onRelease = function() {
//load large images
mcLoader.loadClip(largeImageUrl[target_mc.pictureValue],largeImage_mc);
caption.text = captions[target_mc.pictureValue];;
p++;//increment value to cycle through array
if (p<thumbUrl.length) {
loadThumbs();//create loop
if (p == thumbUrl.length) {
/*we set this variable here because this is where we know the length of our thumbnails containing mc.
After we have loaded all content in. Makes sense really!*/
mcWidth = thumbMask_mc.thumbBox_mc._width;
//adjust the width and height of the thumbstrack bg clip
thumbMask_mc.thumbBox_mc.thumbTrackBg._width = mcWidth;
thumbMask_mc.thumbBox_mc.thumbTrackBg._height = thumbMask_mc.thumbBox_mc._height
/*add the mouse listener object to the thumbnail mask. We do this element of our script here so
we do not enable scrolling of our mc before the images have all loaded in. As this can look a little funny*/
Mouse.addListener(mouseListener);
//load in the next thumb
Clip.addListener(mclListener);
Clip.loadClip(thumbUrl[p],container);
REMOVE ALL THUMBS METHOD
//Use to clear old thumbs if you are going to add in a new set of thumbs
function removeAllThumbs():Void {
for (var i in thumbMask_mc.thumbBox_mc) {
if (typeof (thumbMask_mc.thumbBox_mc[i]) == "movieclip") {
removeMovieClip(thumbMask_mc.thumbBox_mc.getInstanceAtDepth(thumbMask_mc.thumbBox_mc[i].ge tDepth()));
thumbMask_mc.thumbBox_mc._width = thumbMask_mc._width
/*sampleRemoveAllButton.onRelease = function(){
removeAllThumbs()
LOAD LARGE IMAGES MOVIECLIP LOADER FUNCTION
/*generic load object here we handle loading in external images etc
this block of code loads the large images into the bright blue mc
for instance, you could fade in/out big images or make a progress indicator
using this block of script*/
var mcLoader:MovieClipLoader = new MovieClipLoader();
var listener:Object = new Object();
listener.onLoadStart = function(target_mc:MovieClip) {
//empty
listener.onLoadProgress = function(target:MovieClip, bytesLoaded:Number, bytesTotal:Number):Void  {
//amountLoaded = Math.floor((bytesLoaded/bytesTotal)*100);//calulate a loading percentage!
listener.onLoadInit = function(target:MovieClip):Void  {
//empty
mcLoader.addListener(listener);
MOUSE LISTENER
//this handles the panning of the thumbnails
mouseListener = new Object();
mouseListener.onMouseMove = function() {
if (thumbMask_mc.hitTest(_root._xmouse, _root._ymouse, true)) {
maskOver();//call the scroll function
SCROLLER FUNCTION
var scrollSpeed:Number = 5;
var halfMaskWidth:Number = thumbMask_mc._width/2;
var npixels:Number;
var mcWidth:Number = thumbMask_mc.thumbBox_mc._width;
var maskWidth:Number = Math.floor(thumbMask_mc._width);
function slideThumbs() {
// stop scrolling if we are off the mask and delete the enterframe event
if (!thumbMask_mc.thumbBox_mc.hitTest(_root._xmouse, _root._ymouse, true)) {
delete this.onEnterFrame;
// mouse over left half of slider:
if (thumbMask_mc._xmouse>0 && thumbMask_mc._xmouse<thumbMask_mc._x+halfMaskWidth) {
npixels = (halfMaskWidth-thumbMask_mc._xmouse)/halfMaskWidth*scrollSpeed;
thumbMask_mc.thumbBox_mc._x += npixels;
//stop sliding too far to the left
if (thumbMask_mc.thumbBox_mc._x>=0) {
thumbMask_mc.thumbBox_mc._x = 0;
delete this.onEnterFrame;
// mouse over right half of slider:
if (thumbMask_mc._xmouse>halfMaskWidth && thumbMask_mc._xmouse<thumbMask_mc._x+thumbMask_mc._width) {
npixels = (thumbMask_mc._xmouse-halfMaskWidth)/halfMaskWidth*scrollSpeed;
thumbMask_mc.thumbBox_mc._x -= npixels;
//stop sliding too far to the right
if (thumbMask_mc.thumbBox_mc._x<=-(mcWidth-maskWidth)) {
thumbMask_mc.thumbBox_mc._x = -(mcWidth-maskWidth);
delete this.onEnterFrame;
//function to do the scrolling man!
function maskOver() {
this.onEnterFrame = function() {
slideThumbs();

Answer 1

I am using Flash CS 4, like I mentioned earlier, I am making this site on some one's pre-made flash file. There is a movie symbol for loading the large images (called largeImage_mc). I resized this movie clip to 550x450 px (landscape). And positioned it at X=200 Y=0 (top left corner registration point or the anchor point).
The movie clip could be dragged to any position. But images that are loaded into this bo is always aligning to the top left corner of this movie symbol.
If I calculate the actual center of this image loading area (regarding its position on the window), it would be x=425, y=225.
I hope my writing makes sence.
actual site: www.chimeddorj.com