Quote:
Random validation (CAPTCHA) image ver. 1.00
released: 2005-12-10
Use this script to protect your contact form or your whois query tool or just all forms where some extra validation is needed. A session will be created inside a dynamic image file (requires GD library). The random value of this image appears inside the generated CAPTCHA image. The user has to enter this value into a formfield. This value will be checked while processing the form. Without entering this value a form will not be processed. This mechanism is very usefull to protect your form again (spam) bots.
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^^^^this is the description for the captcha script
I hope you reffer to captcha when you say
shoutbox(??). If so, maybe this will help you (assuming you want it in php):
http://www.finalwebsites.com/snippets.php?id=39