Index: users.inc.t
===================================================================
RCS file: /forum21/install/forum_data/src/users.inc.t,v
retrieving revision 1.84
diff -u -r1.84 users.inc.t
--- users.inc.t	6 Nov 2003 01:33:42 -0000	1.84
+++ users.inc.t	8 Nov 2003 00:00:46 -0000
@@ -61,7 +61,7 @@
 	define('t_thread_view', $u->users_opt & 128 ? 'thread' : 'threadt');
 
 	/* theme path */
-	@define('fud_theme', 'theme/' . str_replace(' ', '_', $u->theme_name) . '/');
+	@define('fud_theme', 'theme/' . preg_replace('![^A-Za-z0-9_]!', '_', $u->theme_name) . '/');
 
 	/* define _uid, which, will tell us if this is a 'real' user or not */
 	define('_uid', ($u->users_opt & 131072) && !($u->users_opt & 2097152) ? $u->id : 0);