If you have a cursory understanding of JavaScript and it's syntax i highly recommend you check out some of Douglas Crockford's content: <a href="http://javascript.crockford.com/" rel="nofollow">http://javascript.crockford.com/</a>. He is the man who invented the JSON format (if you don't know what that is yet, don't worry, you'll come across it soon enough), and wrote an excellent tool called JSLint. He is an authority on the language.<p>His website has innumerable musings, explanations and interesting perspectives on all things JavaScript and he links to <i>lots</i> lots of videos of his various talks. His YUI Theatre videos are of particular interest as they are very comprehensive.