No one replied, most likely, because this is the non-technical conversation only forum. Please only use the technical forums listed here for technical questions.

Also, do not put it in ENTER_FRAME. TweenLite has its own ENTER_FRAME event. By using ENTER_FRAME, you're having TweenLite reset itself over and over again, even if the mouse isn't moving. Instead, use MouseEvent.MOUSE_MOVE and make sure it's not checking for a mouse movement globally, but only within the bounds of the gallery preview images.