The simple lazy-coder way to do it would be to actually MAKE one long image of the two of them, and slide over to the next...
Haha, it certainly sounds lazier, but I'm trying to avoid that at all costs...if you have one screen that can shift in four directions and 50+ screens, it wouldn't be such an easy task anymore.
If I understood correct, you need two images to be moved at the same time. One of the ways to do so
xalign 1.0 xanchor 0.0 # pic_2 will be placed at right offscreen
xalign 0.0 xanchor 1.0 # pic_1 will be placed at left offscreen
with move # will change positions of all images above it
I...forgot about regular move transitions. How did I manage that?? Anyways, I can't see how this is happening, but the first image appears to get completely skipped over unless I put a pause in, but it disappears during the move transitions (and not as in "falls off the screen" disappear, that would be a good thing). I'll try fiddling with it some more though, thanks!
EDIT: Nevermind, it's working now! Thanks a ton!