Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.40
diff -u -F^f -r1.40 form.inc
--- includes/form.inc	2 Jan 2006 08:35:59 -0000	1.40
+++ includes/form.inc	5 Jan 2006 10:55:20 -0000
@@ -682,7 +682,7 @@ function theme_checkbox($element) {
   $checkbox .= 'name="'. $element['#name'] .'" ';
   $checkbox .= 'id="'. $element['#id'].'" ' ;
   $checkbox .= 'value="'. $element['#return_value'] .'" ';
-  $checkbox .= ($element['#value'] == $element['#return_value']) ? ' checked="checked" ' : ' ';
+  $checkbox .= ($element['#return_value'] == $element['#value']) ? ' checked="checked" ' : ' ';
   $checkbox .= drupal_attributes($element['#attributes']) . ' />';
 
   if (!is_null($element['#title'])) {