Accessing the Joomla Framework via an AJAX Call

gistfile1.txt

define( '_JEXEC', 1 );
define( ' _VALID_MOS', 1 );
define( 'JPATH_BASE', '/path/to/Joomla/installation');
define( 'DS', DIRECTORY_SEPARATOR );
require_once ( JPATH_BASE .DS.'includes'.DS.'defines.php' );
require_once ( JPATH_BASE .DS.'includes'.DS.'framework.php' );
$mainframe =& JFactory::getApplication('site');
$mainframe->initialise();