I think you are really missing the point of what Ajax is.
Ajax is not a language.
It is a methodology of a way to program an application that talks to the server asynchronously with user interactions.
Please read through this article here:
http://en.wikipedia.org/wiki/AJAX and read this from the JavaRanch news letter:
http://www.javaranch.com/journal/200601/Journal200601.jsp#a2 The tutorials on the wiki and the article from the newsletter show you the very basics of what Ajax is. Head Rush Ajax and my book Ajax In Action show you in greater detail how this stuff can be applied and used.
Eric