Ayuda con galería de fotos en XML

Hola chicos,
Os cuento, tengo una galeria hecha con XML que va de la siguiente manera:

//////////////// INITIAL VARS /////////////////////////////////////////////////////////////////////////////////
// Set first gallery displayed by default
_global.galleryNum = 1;
// Set first image displayed by default
_global.ID = 1;
// Set your document stage width and height here
var stageW = 800;
var stageH = 600;
// Set spacing amount between thumbnail images
var thumbSpace = 0;
// Set the maximum amount of thumbs to be displayed here. Scrolling will be enabled if total of thumbs is greater than default_maxThumbs
var default_maxThumbs = 15;
// Set border amount here
var border = 15;
menu_mc.bgX = menu_mc.bg._x;
// Set initial size of white bg here
destWidth = bg_mc.bg._width=400;
destHeight = bg_mc.bg._height=400;
// Alignment varibles
fullscreen_mcY = fullscreen_mc._y;
select_mcY = select_mc._y;
bgX = bg._x;
bgY = bg._y;
menu_mcX = menu_mc._x;
menu_mcY = menu_mc._y;
//////////////// CSS STYLESHEET /////////////////////////////////////////////////////////////////////////////////
var styles = new TextField.StyleSheet();
// Set hyperlink colour and decoration here
styles.setStyle("a:link", {color:'#00FFFF', textDecoration:'none'});
styles.setStyle("a:hover", {color:'#00FFFF', textDecoration:'underline'});
info_mc.txt.html = true;
info_mc.txt.styleSheet = styles;
// Hides these movieclips initially
hover_mc._visible = false;
hover_mc.startDrag([lockCenter]);
info_mc._alpha = 0;
info_mc.destAlpha = 0;
bttnNext._visible = false;
bttnPrev._visible = false;
//////////////// ON STAGE RESIZE /////////////////////////////////////////////////////////////////////////////////
stageListener = new Object();
Stage.addListener(stageListener);
alignObjects = function () {
bg._x = bgX-(Stage.width-stageW)/2;
bg._y = bgY-(Stage.height-stageH)/2;
bg._width = Stage.width;
bg._height = Stage.height;
menu_mc._x = menu_mcX-(Stage.width-stageW)/2+(Stage.width-stageW)/2;
menu_mc._y = menu_mcY+(Stage.height-stageH)/2;
menu_mc.bg._x = menu_mc.bgX-(Stage.width-stageW)/2;
menu_mc.bg._width = Stage.width;
fullscreen_mc._x = -(Stage.width-stageW)/2+Stage.width-fullscreen_mc._width-10;
fullscreen_mc._y = fullscreen_mcY+(Stage.height-stageH)/2;
select_mc._x = -(Stage.width-stageW)/2+10;
select_mc._y = select_mcY+(Stage.height-stageH)/2;
};
stageListener.onResize = function() {
alignObjects();
};
alignObjects();
//////////////// BUTTON FUNCTIONS /////////////////////////////////////////////////////////////////////////////////
bg_mc.bg.bttnNext.onRelease = function() {
nextID();
menu_mc.scroll_mc.thumb_mc["thumb"+_global.ID].selectThumb();
};
bg_mc.bg.bttnNext.onRollOver = function() {
bttnNext._visible = true;
};
bg_mc.bg.bttnNext.onRollOut = bg_mc.bg.bttnNext.onDragOut=function () {
bttnNext._visible = false;
};
bg_mc.bg.bttnPrev.onRelease = function() {
prevID();
menu_mc.scroll_mc.thumb_mc["thumb"+_global.ID].selectThumb();
};
bg_mc.bg.bttnPrev.onRollOver = function() {
bttnPrev._visible = true;
};
bg_mc.bg.bttnPrev.onRollOut = bg_mc.bg.bttnPrev.onDragOut=function () {
bttnPrev._visible = false;
};
info_bttn.bttn.onRelease = function() {
getURL(url[ID], "_blank");
};
info_bttn.bttn.onRollOver = function() {
info_mc.destAlpha = 100;
};
info_bttn.bttn.onRollOut = info_bttn.bttn.onDragOut=function () {
info_mc.destAlpha = 0;
};
nextID = function () {
if (ID0) {
_global.ID--;
loadID();
}
};
loadID = function () {
holder._alpha = -100;
info_mc._alpha = 0;
info_mc.destAlpha = 0;
bg.newHEX = Colour[_global.ID];
menu_mc.hover.txt.text = Caption[_global.ID];
loadMovie(Folder+"/"+Large[_global.ID], holder);
};
_global.thumbClick = function() {
holder._alpha = -100;
loadID();
};
//////////////// ON IMAGE LOAD /////////////////////////////////////////////////////////////////////////////////
alignPic = function () {
destWidth = holder._width;
destHeight = holder._height;
holder._x = (stageW-holder._width)/2;
holder._y = (stageH-holder._height-menu_mc._height)/2;
bg_mc.bg._width += (destWidth+border-bg_mc.bg._width)/5;
bg_mc.bg._height += (destHeight+border-bg_mc.bg._height)/5;
bg_mc.bg._x = holder._x;
bg_mc.bg._y = holder._y;
bg_mc._x = holder._width/2;
bg_mc._y = holder._height/2;
bttnNext._y = holder._y+(holder._height-bttnNext._height)/2;
bttnNext._x = bg_mc._width+(stageW-bg_mc._width)/2-bttnNext._width-border/2;
bttnPrev._y = holder._y+(holder._height-bttnPrev._height)/2;
bttnPrev._x = (stageW-bg_mc._width)/2+bttnPrev._width+border/2;
preloader._x = holder._x+holder._width/2;
preloader._y = holder._y+holder._height/2;
info_mc._x = holder._x;
info_mc._y = holder._y+holder._height-info_mc._height;
info_mc.bg._width = holder._width;
info_mc.txt.htmlText = Copy[_global.ID];
info_mc.txt._width = info_mc.bg._width-20;
info_mc.txt._x = info_mc.bg._x+10;
info_mc.txt._height = info_mc.txt.textHeight+10;
info_mc.bg._height = info_mc.txt._height+20;
};
alignPic();
//////////////// BUILD GALLERY FUNCTION //////////////////////////////////////////////////////////////////////
buildGallery = function () {
_global.ID = 0;
destWidth = 0;
destHeight = 0;
//Remove previously created photos and thumbs
for (j=0; jtotal) {
maxThumbs = total;
}
// Sets destination width and height for each image
for (n=0; n100) {
preloader.left.half._rotation = 180;
preloader.right.half._rotation = 180;
if (bg_mc.hitTest(_parent._xmouse, _parent._ymouse, true) && holder._alpha>=100) {
if (!bttnNext.hitTest(_parent._xmouse, _parent._ymouse, true) && !bttnPrev.hitTest(_parent._xmouse, _parent._ymouse, true)) {
info_mc.destAlpha = 100;
} else {
info_mc.destAlpha = 0;
}
} else {
info_mc.destAlpha = 0;
}
alignPic();
if (holder._alpha0) {
preloader.left.half._rotation = 0;
preloader.right.half._rotation = (360/100)*percentage;
} else if (percentage>50 && percentage);
stop();


Y la historia es si hay alguna manera de que no arranque desde el principio, si no al hacer click en el botón.
Mil gracias.