Making cross domain request is not a difficult task. Use JSONP to make Cross Domain Ajax Requests. Learn how to make JSONP requests with example
Ajax is a group of interrelated web development methods to create interactive web applications. Learn more about ajax technology, history of ajax, advantages and disadvantages of ajax, and so on..
Creating XMLHttpRequest Objects is one of the most important intial steps in making an ajax request. This article is on how to create an XMLHttpRequest Object. Learn more about the XHR Object.
Simple Ajax form tutorial. This article explains how to submit a form using AJAX. This article is very much useful for Ajax beginners.