This tutorial is for those interested in developing rich Web applications that dynamically update content using asynchronous JavaScript and XML (Ajax) with PHP, without having to refresh entire Web pages with each user click.

You will learn about Ajax, as well as issues surrounding its usage. You will also build an Ajax application in PHP that will display panels of a section of a previously written tutorial. Clicking on a panel link will reload only the content section and replace it with the content of the selected panel, saving bandwidth and time loading the page. Then you will integrate the Simple Ajax Toolkit (Sajax) into your Ajax application, which will synchronize the use of Ajax, simplifying development.

Source: www6.software.ibm.com