Added all new images.
Added all new images.

Using some silly innerHTML hack for the prev/next things and quick text
to show how to add the book images too.  Note that the book URLs are
better than the ones you used: drop www where applicable, use the PLAI
proper site.  Also, I took the ROR cover from the PDF, so it's has a
much better resolution.

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket