ActionScript 3.0 :: Free Memory During Slideshow?

I've got this simple script (I left all original comments) that create a slideshow with timer (this is only part of the whole script), it manages the slides loading in the containers on the stage.The problem is that after each loaded slide the ram of the pc increase by 10 Mb! I tried to solve the problem using:

Code:
slideLoader.removeEventListener(Event.ENTER_FRAME, fadeSlideIn);
slideLoader=null;

in the fadeSlideIn function or the same applied to the currentContainer, but without success.

Code:
// reference to the current slider container
var currentContainer:Sprite;
// slides holder[code].......