Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.370
diff -u -p -r1.370 form.inc
--- includes/form.inc	5 Sep 2009 15:05:01 -0000	1.370
+++ includes/form.inc	7 Sep 2009 22:55:07 -0000
@@ -2343,7 +2343,9 @@ function theme_vertical_tabs($element) {
   // Add required JavaScript and Stylesheet.
   drupal_add_library('system', 'vertical-tabs');
 
-  return '<div class="vertical-tabs-panes">' . $element['#children'] . '</div>';
+  $output = '<h2 class="element-invisible">' . t('Tab strip') . '</h2>';
+  $output .= '<div class="vertical-tabs-panes">' . $element['#children'] . '</div>';
+  return $output;
 }
 
 /**
Index: misc/vertical-tabs.js
===================================================================
RCS file: /cvs/drupal/drupal/misc/vertical-tabs.js,v
retrieving revision 1.7
diff -u -p -r1.7 vertical-tabs.js
--- misc/vertical-tabs.js	31 Aug 2009 05:51:08 -0000	1.7
+++ misc/vertical-tabs.js	7 Sep 2009 22:55:08 -0000
@@ -85,6 +85,8 @@ Drupal.verticalTab.prototype = {
       .siblings(':hidden.vertical-tabs-active-tab')
         .val(this.fieldset.attr('id'));
     this.item.addClass('selected');
+    $('#active-vertical-tab').remove();
+    this.item.append('<span id="active-vertical-tab" class="element-invisible">' + Drupal.t('(active tab)') + '</span>');
   },
 
   // Updates the tab's summary.
@@ -111,7 +113,7 @@ Drupal.theme.prototype.verticalTab = fun
   tab.item = $('<li class="vertical-tab-button"></li>')
     .append(tab.link = $('<a href="#"></a>')
       .append(tab.title = $('<strong></strong>').text(settings.title))
-      .append(tab.summary = $('<small class="summary"></small>')
+      .append(tab.summary = $('<span class="summary"></span>')
     )
   );
   return tab;