You can change the icons if you have Adobe Flash. If you do,
open up skin_toc.fla, and you'll see the icon. After you make your
changes, export the file as a movie.
If you have already generated your output with a Flash skin,
skin_toc.fla will be in your skin folder (the default directory is
!SkinSubFolder!, then the directory with the skin name, in your
source file directory). If you have not run your output, you can
find basic Flash skin files in the FlashHelp SDK folder where you
installed RoboHelp on your hard drive. I usually pick a skin out of
the FlashHelp gallery that is the closest to what I want and
generate the output once with that, then edit the skin files in the
!SkinSubFolder! directory.
--Ben