I am trying to create two stacks of images on one slide. Each stack will have 20 images each. Basically two decks of cards; when the mouse is over a stack and you scroll, it changes the images as you scroll. (It sounds confusing but its hard to explain). These images are of a CT and an MRI of the neck. I am trying to lay the images on top of each other so that when you scroll, it would appear as your looking up and down the neck.

What I have tried is created two powerpoints with just the images, 1 image per slide. Then made a new powerpoint and inserted the image-powerpoints as objects on one slide. However, when I scroll over them, nothing happens. But when I click on on of them, that powerpoint opens in full screen and I am able to scroll up and down the stack of images in just that one stack.

Any way to do this?