you could use a print media stylesheet that hides all other content from the
printer.
that would mean people couldn't print the other things on the page if
wanted.
don't know if it's good code, but a google came up with this snip of
javascript in a discussion group-
http://splike.com/wiki/HTML_print_part_of_page
i think the person wanted to print just three different things, only one at
a time.
you could simplify that a lot since you only want to print one image. it's
maybe a starting point
--
Alan
Adobe Community Expert, dreamweaver
http://www.adobe.com/communities/experts/