OCR and neural network in Javascript

A certain Shaun Friedle wrote a curious javascript that automates captcha recognition on megaupload.

A couple of interesting features of the script:

1. HTML 5 is used; the javascript getImageData function for working with pixels;
2. an artificial neural network is used for recognition and works quite accurately.

Work example: herecomethelizards.co.uk/mu_captcha
Source: userscripts.org/scripts/review/38736