This experiment reminds me of one of my recent experiments: http://madebyevan.com/nn-gait/. Mine ends up figuring how to walk relatively quickly. It does have a regular pulse as an input though.
I'm always confused when people ask me this question. All browsers have the ability to view the source code of a web page (View > Developer > View Source in Chrome). The source code is here: http://madebyevan.com/nn-gait/script.js. Is that what you meant?
Most people assume the in-browser code will not be the fully commented, clean and presentable code that is more likely to appear on Github, I think that's what prompts queries like this :)
