script to preview two .png s side by side?

I want to display A.png and B.png together, A left / B right or A top / B bottom.

I can of course

preview A.png
preview B.png

separately, then resize and move the two windows next to each other, but that's a pain if you do it a lot. Can it be scripted ?

If not, is there an opensource preview-like that can display side-by-side ?

(I have 10.8.3 . if-preview-app-in-os-x-is-not-applescriptable-why-does-this-work on SO has a comment "Preview does have an AppleScript dictionary by default in 10.9 but not in earlier versions of OS X." )