an easier way...

if you do not need your cursor to be very precise:

name your instance name for your new cursor movieclip "cursor"
then add this code to frame 1 of your main timeline:

Mouse.hide();
stage.addEventListener(MouseEvent.MOUSE_MOVE,follow);
function follow(evt:MouseEvent){
 cursor.x = mouseX;
 cursor.y = mouseY;
}

Now all you need to do is double click on your movie clip and

move the object to align with the crosshair (this is the registration

point for your cursor).