I am making up a homework very long book for my students, and I want to
also be able to print out an answer key also. It is very convenient to use
hidden text because I can print it without the answers for the students and
with the answers for myself. Although that works beauifully for text, many
of the answers are drawings. Sometimes they are line drawings, sometimes
bitmaps (Jpeg or Bmp), and I know of no way to hide the drawings or bitmaps.

Can someone tell me how to do this?

--
Gary Burton