SAJA
Saja is an open-source AJAX scripting engine for PHP with secure function calls. It is designed for fast creation of simple, intuitive, and updatable AJAX applications, without the need to write any JavaScript.
Saja is currently implemented through PHP only. It consists of 4 files. You should only need to edit saja.functions.php to get it to work. The only other requirement is that all 4 files must reside in the same directory