[themes] how toi theme a box and how to theme a file ?

Hi all. I have a template file called "foo.tpl.php", and I have $vars. How can i theme "foo.tpl.php" with $vars ? I have thinked that I need to use "theme" function(), but how ? And for a box ? M. -- Michel 'ZioBudda' Morelli michel@ziobuddalabs.net Sviluppo applicazioni CMS DRUPAL e web dinamiche (LAMP+Ajax) Telefono: 0200619074 Telefono Cell: +39-3939890025 -- Fax: +39-0291390660 http://www.ziobudda.net ICQ: 58351764 http://www.ziobuddalabs.it Skype: zio_budda http://www.ziodrupal.net MSN: michel@ziobuddalabs.it JABBER: michel@ziobuddalabs.it