AJAX: DHTML and CSS CAPTCHA
Alexander Selifonov (contact me)
This class can be used to implement CAPTCHA validation using colored boxes that the user must click which are validated using AJAX requests.
It renders a grid of boxes on which only one box is colored differently to indicate the user must click it.
The class sends an AJAX request to the server passing the coordinates of the user clicks until a given number of clicks correctly point to the colored boxes.
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