Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.613
diff -b -U3 -r1.613 common.inc
--- includes/common.inc	24 Jan 2007 14:48:35 -0000	1.613
+++ includes/common.inc	26 Jan 2007 16:17:48 -0000
@@ -1737,8 +1737,8 @@
  */
 function drupal_urlencode($text) {
   if (variable_get('clean_url', '0')) {
-    return str_replace(array('%2F', '%26', '%23'),
-                       array('/', '%2526', '%2523'),
+    return str_replace(array('%2F', '%26', '%23', '%2C'),
+                       array('/', '%2526', '%2523', ','),
                        urlencode($text));
   }
   else {