Dear Contexters!
In the last few days I could read a few posts about
"animations" in a resulting PDF document. Some
statements mentioned java script as possible means
to create an animation.
Is it possible to do the following (which is rather
simple using html and javascript)?

  -- Have a bunch of thumbnail pictures
  -- When you click on a thumbnail you see a
     larger version of the same picture
  -- With the next mouseclick the picture
     vanishes (you see the gallery of thumbnails again)

if yes, how?
Any hints are welcome.

kind regards
Erik