Fed up with ‘visitors’ to your guestbook posting “Great Job! Try [this drug] for [this body part] enhancement”? Then you need something to bot-proof your forms. And one simple solution is a captcha.
The CAPTCHA script requires that your server version of php has been compiled to include the GD2 library (otherwise the images cannot be created!). Any respectable web hosting services will have GD2 pre-installed.
* use your own background image (the captcha is randomly selected)
* easily change font family, font size, font color, font rotation, and font weight
* script documented in case you really want to change it
* Works with register_globals off
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