paraclete

Great stuff JustSomeGuy, thank you

Yes - great. Thanks - I can work on that. I suppose I was hoping that since so many people seem to use these things there might be some ready-made source out there. Some of the systems seem to generate the graphic on the fly - or does it only seem like it? I have yet to find a site that repeats its code (when repeatedly refreshed) which sort of implies a directory somewhere with (potentially) hundreds of graphics in.

When I registered for this forum I had to enter a 6 digit security number (often called a User Challenge). Many sites use this on email generating forms and it appears its often done in PHP. I want to create a form to be emailed to me and want a User Challenge code to prevent spam. How is the image of the code generated? How is the value of the code passed on for checking? Thanks for you help.