This is my first attempt at something for osC

I am not a professional coder so if this turns out to be an example of how not todo captcha for osC then I hope it serves as a good example.

based on GPL code...
* CaptchaSecurityImages.php
* Author: Simon Jarvis
* Requirements: PHP 4/5 with GD and FreeType libraries

it works on my box :) feedback is appreciated

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