MooTools. This framework includes useful client-side features for handling AJAX.
Please note that the version of MooTools that is included with Joomla! is 1.1.1 for all releases up to and including Joomla! 1.5.13. From version 1.5.14 and later MooTools 1.1.2 is included. The latest major release of MooTools is 1.2, which is not compatible with the versions included with Joomla! 1.5. Replacing ...