rendering animation effects

hi there, i want to ask some help about flash, well anyone knows the rendering animation when you rendering in 3dsmax. i want to make an animation same with that in flash. please take a look at my swf file here http://freewebs.com/crizdesign/rendering.swf .. i want to make every point of the box will permanently become colored to fill all the black white picture and turn it to colored picture. in my flash file there are two images 1 black & white and 1 colored image. the box that moving around the image is the mask. i want that mask multiply(if possible) to fill the black and white image with the colored image. Anyway this link (http://freewebs.com/crizdesign/untitled.png) is the sample screen shots of actual rendering in 3dmax that i want to be done in flash.
please help if you have any idea.. thankss

You make the mask into a shape tween so as the box "moves", it is actually just adding to the shape that you are using as your mask. Basically just create a layer and on that layer tween an image that looks like a box flying around the screen. Then just use that as a mask layer over the images as you have them.