this.createEmptyMovieClip("images", 100);
this.attachMovie("mask", "mask", 101);
mask._x = images._x =250;
mask._y = target = 200;
images.setMask(mask);
images._y = -1000;
speed = 5;
for (var i = 0; i<20; i++) {
var img = images.attachMovie("image"+i, "image"+i, i);
img._y = img._height*i;
var thumb = this["thumb"+i];
thumb._alpha = 60;
thumb.pos = target+(i*-img._height);
thumb.onPress = function() {
target = this.pos;
};
thumb.onRollOver = function() {
this._alpha = 100;
};
thumb.onRollOut = function() {
this._alpha = 60;
};
}
this.onEnterFrame = function() {
images._y += (target-images._y)/speed;
};

this.createEmptyMovieClip("images", 100);

unloadMovie()

images.removeMovieClip();
mask.removeMovieClip();