/**
 * Returns true if the request comes from an ajax call
 *
 * @return bool
 * @author Robert Agthe
 */
function is_ajax()
{
	return (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest')?true:false;
}

ajax call or no ajax call

ajax, js, php, textmate

PHP