Flexible Ajax

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Flexible Ajax is a handler to combine the remote scripting technology, also known as AJAX (Asynchronous Javascript and XML), with a php-based backend.
The AJAX Technique is best described in the wikipedia article and the original article on adaptivepath.com, giving the technique the name AJAX.
Basically, Flexible Ajax is the tool to call php functions from within javascript and handle the returned values, without having to reload the entire page.