Links for advanced JavaScript, Prototype

http://www.sergiopereira.com/articles/advjs.html -- has JavaScript changed? (JSON, Function Objects, Class prototype)
http://www.sergiopereira.com/articles/prototype.js.html - Unofficial reference to Prototype
http://www.tutorialspoint.com/prototype/prototype_overview.htm
http://www.sitepoint.com/article/painless-javascript-prototype
http://particletree.com/features/quick-guide-to-prototype/

https://ajax.dev.java.net/ - JMaki