Help with your thumbNailScroller function

Im very new with programming in Flash. I was reading your tutorial on adding a thumbnail to an image gallery. Im trying to use your [FONT=Arial][SIZE=2]thumbnail_final.fla inside another movie and is not working for me. I made a movie, in Scene 1 of this movie i have an empty movie clip(DisplayArea) and a menu button(Gallery) so that when i hit the Gallery button it load the thumbnail)final movie into the empty movie clip DisplayArea. Everything work except for the [FONT=Arial][SIZE=2]thumbNailScroller function. It load all the thumbnails and you can click them and they load the matching big picture and all but the scrolling function is not working. I tried chanigin a few thing but im very new to programming can anybody help me?

function thumbNailScroller() {
// thumbnail code!
this.createEmptyMovieClip(“tscroller”, 1000);
scroll_speed = 10;
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._x -= scroll_speed;
} else if ((_root._xmouse<=(hit_left._x+40)) && (thumbnail_mc.hitTest(hit_left))) {
thumbnail_mc._x += scroll_speed;
}
} else {
delete tscroller.onEnterFrame;
}
};

As i debug the movie the thumbnail_mc appears as a _level0.DisplayArea.thumbnail_mc[/SIZE][/FONT][/SIZE][/FONT]