From the several replies, I gather that one shouldn't use any kind of IMG in a regular node (home nodes don't use the same "approved" list), and if I wanted to refer to a screen shot I could use a HREF.

Thanks to y'all for the several good replies I got in just a few minutes--I can continue with my main post without further delay. No thanks to whoever voted it down--it was an honest question and I had SuperSearched first, etc.

—John