Which is the easiest javascript framework/library to learn and develop DHTML, DOM and AJAX applications with codeigniter

[eluser]Nick Husher[/eluser]
++ On Doug Crockford. He recommends Javascript - The Definative Guide as [a|the only] good book for learning Javascript. I second the recommendation; the book covers everything you could possibly want to know about the strange language that is javascript.

All the frameworks do the same basic things; they smoothe the differences between IE and the other browsers, they offer convenience tools for DOM scripting, and (IMO) most importantly they offer fully-featured unobtrusive event handling.

BTW, I happen to like YUI. It's a bit daunting at first, but it's very well documented and very feature-complete.