Hi ClubHans
You probably don't realize it, but you have answered your own
question!
The fact is, in a WebHelp system, the book and page icons are
simple images. Either the image contains the + or - symbol or it
doesn't. If you want the symbols, you will need to either edit your
existing images to include them, or substitute images that contain
the symbols as part of the image.
Cheers... Rick