Zend Framework: Setup Autoloader to find namespace from specific directory

Question

how do i setup the autoloader to find all classes in the namespace 'Entities' and 'Proxies' in APPLICATION_PATH . '/Entities' and 'APPLICATION_PATH . '/Proxies'' respectively.

UPDATE

i managed to make it work putting \Entities and \Proxies in \library\Application and add autoloaderNamespaces[] = Application in application.ini. but what if i want to put them in APPLICATION_PATH instead and point the autoloader to find classes with the namespaces Entities & Proxies in the APPLICATION_PATH

FYI: i am using PHP 5.3 namespaces if that matters. i am using doctrine