Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.405
diff -u -p -r1.405 form.inc
--- includes/form.inc	23 Nov 2009 22:37:37 -0000	1.405
+++ includes/form.inc	24 Nov 2009 15:17:01 -0000
@@ -2252,7 +2252,7 @@ function form_process_container($element
 function theme_container($variables) {
   $element = $variables['element'];
   if (!isset($element['#attributes']['id'])) {
-    $element['#attributes']['id'] = drupal_html_id($element['#id']);
+    $element['#attributes']['id'] = $element['#id'];
   }
   // Force the 'form-wrapper' class.
   $element['#attributes']['class'][] = 'form-wrapper';