SM_PATH only required for CALLED pages, not includes.

plugins/filters/setup.php

@@ -24,8 +24,6 @@
  * $Id$
  */
 
-/* Path for SquirrelMail required files. */
-if (!defined('SM_PATH')) define('SM_PATH','../../');
 /* SquirrelMail required files. */
 require_once(SM_PATH . 'plugins/filters/filters.php');