XML Thumbnail Photo Gallery - I want to scroll vertically

programming flash
1

I completed kirupa’s handy little thumbnail photogallery tutorial. I would like to scroll vertically and I realize I need to change the x and y values at different spots and I was able to make it face vertically and I can get it to scroll up but not back down. Any help would be appreciated. here is the code

function thumbNailScroller() {
thumbnail code!
//this.createEmptyMovieClip(“tscroller”, 1000);
scroll_speed = 5;
tscroller.onEnterFrame = function() {
if ((_root._ymouse>=thumbnail_mc._y) && (_root._ymouse<=thumbnail_mc._y+thumbnail_mc._height)) {
if ((_root._xmouse>=(hit_right._x-40)) && (thumbnail_mc.hitTest(hit_right))) {
thumbnail_mc._y -= scroll_speed;
} else if ((_root._xmouse<=40) && (thumbnail_mc.hitTest(hit_left))) {
thumbnail_mc._y += scroll_speed;
}
} else {
delete tscroller.onEnterFrame;
}
};
}

function thumbnails_fn(k) {
thumbnail_mc.createEmptyMovieClip(“t”+k, thumbnail_mc.getNextHighestDepth());
tlistener = new Object();
tlistener.onLoadInit = function(target_mc) {
target_mc._y = hit_left._y+(eval(“thumbnail_mc.t”+k)._height+2)*k;
target_mc.pictureValue = k;
target_mc.onRelease = function() {
p = this.pictureValue-1;
nextImage();
};