Pro JavaScript Techniques
John Resig
Apress
Pro JavaScript Techniques is the ultimate JavaScript book for the modern web developer. It provides everything you need to know about modern JavaScript, and shows what JavaScript can do for your web sites. This book doesn't waste any time looking at things you already know, like basic syntax and structures.  Expert web developer and author John Resig concentrates on fundamental, vital topics - what modern JavaScripting is (and isnt), the current state of browser support, and pitfalls to be wary of.