most of the p.g. e-texts are text-only.
but some of them do have pictures, so
your system must be able to show 'em.
http://z-m-l.com/go/alice/checking_watch.png
put a picture here, or maybe a button that someone could click in order to view that picture...
http://z-m-l.com/go/alice/cat_fades.png
“what is the use of a book,” thought alice, “without pictures or conversation?”
http://z-m-l.com/go/alice/alice_cramped.png