Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.445
diff -u -r1.445 form.inc
--- includes/form.inc	26 Mar 2010 18:58:12 -0000	1.445
+++ includes/form.inc	28 Mar 2010 22:04:42 -0000
@@ -2855,9 +2855,12 @@
  */
 function theme_form($variables) {
   $element = $variables['element'];
+  $wrapper_attributes = array(
+    'class' => array('form-wrapper'),
+  );
   // Anonymous div to satisfy XHTML compliance.
   $action = $element['#action'] ? 'action="' . check_url($element['#action']) . '" ' : '';
-  return '<form ' . $action . ' accept-charset="UTF-8" method="' . $element['#method'] . '" id="' . $element['#id'] . '"' . drupal_attributes($element['#attributes']) . ">\n<div>" . $element['#children'] . "\n</div></form>\n";
+  return '<form ' . $action . ' accept-charset="UTF-8" method="' . $element['#method'] . '" id="' . $element['#id'] . '"' . drupal_attributes($element['#attributes']) . ">\n<div" . drupal_attributes($wrapper_attributes) . '>' . $element['#children'] . "\n</div></form>\n";
 }
 
 /**