AJAX CAPTCHA

AJAX based CAPTCHA to determine if the user is a human.

If you are one those wondering what a CAPTCHA means. Here’s an explanation from WIKIPEDIA.
“A CAPTCHA is a type of challenge-response test used in computing to determine whether the user is human. The process involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade. Because computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. A common type of CAPTCHA requires that the user type the letters of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen.”

Check out the video demo

Try the demo and download the source from the below link.
http://psyrens.com/captcha/