Script Mask in level

Need some help with creating a mask that only affects
a created movieclip in level 2

this is the movie that I want to mask

_root.createEmptyMovieClip(“preview”, 2);
loadMovie(“PreviewAnnonce.swf”, “preview”);

I guees that Ive got to create a MaskMovie.swf but ??? how

:slight_smile:

Pauk