This video gives just a fresh start on the topic. To be honest, jQuery's Ajax implementation is sometimes prone to error in IE, while Prototype's one works well. As I said before, to be on the safe side is better to write your own, simple Ajax classes instead of relying on something that you cannot fully control. Just write your classes in a reusable way and you won't need an entire library to fetch content or submitting a form. I can guarantee it.