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	5 Sep 2009 09:12:59 -0000
@@ -37,11 +37,13 @@ Drupal.behaviors.verticalTabs = {
 
       $('> li:first', list).addClass('first');
       $('> li:last', list).addClass('last');
+      $('> li a', list).attr('tabindex', 999);
 
       if (!focus) {
         focus = $('> .vertical-tabs-pane:first', this);
       }
       focus.data('verticalTab').focus();
+      Drupal_verticalTabs_addKeyboardSupport();
     });
   }
 };
@@ -117,4 +119,75 @@ Drupal.theme.prototype.verticalTab = fun
   return tab;
 };
 
+/**
+ * Function to add support for tabbing through all the tabs.
+ * What with empty tabs? or tabs with all inputs disabled? it breaks
+ */
+
+Drupal_verticalTabs_addKeyboardSupport = function () {
+
+$('div.vertical-tabs-panes > fieldset').not(':last').each(
+  function() {
+    // All but radio
+    $(':input:enabled:last', this).not('[type=radio]').bind ('keydown', 
+    function(e) {
+      if (!e.shiftKey && e.keyCode == 9) {
+        var t = $(this);
+        var fs = t.closest('fieldset');
+        var n = fs.next();
+        var c1 = $(':input:enabled:first', n);
+        n.data('verticalTab').focus();
+        c1.focus();
+        return false;
+      }
+    });
+    // Radios
+    var radioname = $(':input:enabled:last[type=radio]', this).attr('name');
+    $('[name='+radioname+']').bind ('keydown', 
+    function(e) {
+      if (!e.shiftKey && e.keyCode == 9) {
+        var t = $(this);
+        var fs = t.closest('fieldset');
+        var n = fs.next();
+        var c1 = $(':input:enabled:first', n);
+        n.data('verticalTab').focus();
+        c1.focus();
+        return false;
+      }
+    });
+
+  });
+
+$('div.vertical-tabs-panes > fieldset').not(':first').each(
+  function() {
+    // All but radio
+    $(':input:enabled:first', this).not('[type=radio]').bind ('keydown', 
+    function(e) {
+      if (e.shiftKey && e.keyCode == 9) {
+        var t = $(this);
+        var fs = t.closest('fieldset');
+        var n = fs.prev();
+        var c1 = $(':input:enabled:last', n);
+        n.data('verticalTab').focus();
+        c1.focus();
+        return false;
+      }
+    });
+    // Radios
+    var radioname = $(':input:enabled:first[type=radio]', this).attr('name');
+    $('[name='+radioname+']').bind ('keydown', 
+    function(e) {
+      if (e.shiftKey && e.keyCode == 9) {
+        var t = $(this);
+        var fs = t.closest('fieldset');
+        var n = fs.prev();
+        var c1 = $(':input:enabled:last', n);
+        n.data('verticalTab').focus();
+        c1.focus();
+        return false;
+      }
+    });
+  });
+}
+
 })(jQuery);