codice:
var b:MovieClip = _root.createEmptyMovieClip("b", _root.getNextHighestDepth());
b.scrollRect = new flash.geom.Rectangle(0, 0, Stage.width, Stage.height);
var l:Object = new MovieClipLoader();
l.onLoadInit = function (t:MovieClip) { t._height = (Stage.width * t._height) / t._width; t._width = Stage.width; t._y = (Stage.height - t._height)/2; t.forceSmoothing = true; };
l.loadClip("photoGallery/1.jpg", b.createEmptyMovieClip("m", b.getNextHighestDepth()));
b.onMouseMove = function () {
if (this.hitTest(_xmouse, _ymouse)) {
caurina.transitions.Tweener.addTween(b.m, {_y:-(_ymouse/b.scrollRect.height*(b.m._height-b.scrollRect.height)), time:1});
caurina.transitions.Tweener.addTween(b.m, {_x:-(_xmouse/b.scrollRect.width*(b.m._width-b.scrollRect.width)), time:1});
}
}
var stageListener = new Object();
stageListener.onResize = function (){
b._x = 0;// qui non dovrebbe posizionarsi a 0???
b._y = 0;
b.m._width = Stage.width;
b.m._height = Stage.height;
};
Stage.addListener(stageListener);
hai ragione... funziona e ci siamo quasi 
se provo a ridimensionare lo stage non riesco a posizionare la clip a x=0 e y=0 occupando ttto lo stage...

dove sbaglio?
grazie