A JavaScript code quality program that looks for problems in JavaScript programs. If it finds a problem, it returns a message describing the problem and an approximate location within the source.
www.jslint.com
A comprehensive listing of JavaScript objects, properties and methods. Includes explanations and examples.
www.javascriptkit.com/jsref/
This article provides a whirlwind tour of the Prototype library. It aims to give you enough examples and resources to get started using Prototype in your DOM scripting projects.
articles.sitepoint.com/print/painless-javascript-prototype