Index: vertical-tabs.css
===================================================================
RCS file: /cvs/drupal/drupal/misc/vertical-tabs.css,v
retrieving revision 1.6
diff -u -r1.6 vertical-tabs.css
--- vertical-tabs.css	31 May 2009 00:51:41 -0000	1.6
+++ vertical-tabs.css	16 Sep 2009 16:49:25 -0000
@@ -4,7 +4,7 @@
   margin: 1em 0 1em 15em;
   border: 1px solid #ccc;
 }
-div.vertical-tabs ul.vertical-tabs-list {
+div.vertical-tabs dl.vertical-tabs-list {
   width: 15em;
   list-style: none;
   list-style-image: none; /* IE6 */
@@ -25,7 +25,7 @@
 }
 
 /* Layout of each tab */
-div.vertical-tabs ul.vertical-tabs-list li {
+div.vertical-tabs dl.vertical-tabs-list dt {
   background: #eee;
   border: 1px solid #ccc;
   border-top: 0;
@@ -33,36 +33,44 @@
   margin: 0;
   height: 1%;
 }
-div.vertical-tabs ul.vertical-tabs-list li a {
+div.vertical-tabs dl.vertical-tabs-list dt a {
   display: block;
   text-decoration: none;
   padding: 0.5em 0.6em;
   line-height: 1.3em;
   height: 1%;
 }
-div.vertical-tabs ul.vertical-tabs-list li a:focus {
+div.vertical-tabs dl.vertical-tabs-list dt a:focus {
+  background-color: fuchsia;
   position: relative;
   z-index: 5;
 }
-div.vertical-tabs ul.vertical-tabs-list li a:hover {
+
+div.vertical-tabs dl.vertical-tabs-list dt a:hover {
+  background-color: yellow;
   text-decoration: none;
 }
-div.vertical-tabs ul.vertical-tabs-list li.selected {
+
+div.vertical-tabs dl.vertical-tabs-list dt.selected {
   background: #fff;
   border-right-width: 0;
   position: relative;
 }
-div.vertical-tabs ul.vertical-tabs-list li.selected a:focus {
+
+div.vertical-tabs dl.vertical-tabs-list dt.selected a:focus {
+  background-color: lime;
   outline: 0;
 }
-div.vertical-tabs ul.vertical-tabs-list li.selected strong,
-div.vertical-tabs ul.vertical-tabs-list li.selected small {
+div.vertical-tabs dl.vertical-tabs-list dd.selected strong,
+div.vertical-tabs dl.vertical-tabs-list dd.selected small {
   color: #000;
 }
-div.vertical-tabs ul.vertical-tabs-list .summary {
+div.vertical-tabs dl.vertical-tabs-list .summary {
   display: block;
+  font-size: smaller;
+  padding-bottom: 0;
 }
-div.vertical-tabs ul.vertical-tabs ul.vertical-tabs-list .summary {
+div.vertical-tabs dl.vertical-tabs dl.vertical-tabs-list .summary {
   line-height: normal;
   margin-bottom: 0;
 }
Index: vertical-tabs.js
===================================================================
RCS file: /cvs/drupal/drupal/misc/vertical-tabs.js,v
retrieving revision 1.7
diff -u -r1.7 vertical-tabs.js
--- vertical-tabs.js	31 Aug 2009 05:51:08 -0000	1.7
+++ vertical-tabs.js	16 Sep 2009 16:44:30 -0000
@@ -19,12 +19,15 @@
       var focusID = $(':hidden.vertical-tabs-active-tab', this).val();
       var focus;
       // Create the tab column.
-      var list = $('<ul class="vertical-tabs-list"></ul>');
+      var list = $('<dl class="vertical-tabs-list"></dl>');
       $(this).wrap('<div class="vertical-tabs clearfix"></div>').before(list);
 
       // Transform each fieldset into a tab.
       $('> fieldset', this).each(function () {
-        var tab = new Drupal.verticalTab({ title: $('> legend', this).text(), fieldset: $(this) });
+        var tab = new Drupal.verticalTab({ 
+          title:    $('> legend', this).text(),
+          fieldset: $(this)
+        });
         list.append(tab.item);
         $(this)
           .removeClass('collapsible collapsed')
@@ -35,8 +38,8 @@
         }
       });
 
-      $('> li:first', list).addClass('first');
-      $('> li:last', list).addClass('last');
+      $('> dd:first', list).addClass('first');
+      $('> dd:last', list).addClass('last');
 
       if (!focus) {
         focus = $('> .vertical-tabs-pane:first', this);
@@ -63,6 +66,27 @@
     return false;
   });
 
+  // Keyboard events added:
+  // Releasing the Enter key will open the tab
+  this.link.keyup(function(event) {
+    if (event.keyCode == 13) {
+      self.focus();
+      // Set focus on the first input field of the visible fieldset
+      $("input:visible:enabled:first", $("fieldset.vertical-tabs-pane")).focus();
+      return false;
+    }
+  });
+
+  // Releasing the Escape key lets you leave the tab
+  this.fieldset.keyup(function(event) {
+    if (event.keyCode == 27) {
+      self.focus();
+      // Set focus on the selected tab button again
+      $(".vertical-tab-button.selected").focus();
+      return false;
+    }
+  });
+
   this.fieldset
     .bind('summaryUpdated', function () {
       self.updateSummary();
@@ -108,10 +132,11 @@
  */
 Drupal.theme.prototype.verticalTab = function (settings) {
   var tab = {};
-  tab.item = $('<li class="vertical-tab-button"></li>')
-    .append(tab.link = $('<a href="#"></a>')
+    tab.item = $('<dt class="vertical-tab-button" tabindex="-1"></dt>')
+      //.append(tab.link = $('<span></span>')
+      .append(tab.link = $('<a href="#"></a>')
       .append(tab.title = $('<strong></strong>').text(settings.title))
-      .append(tab.summary = $('<small class="summary"></small>')
+      .append(tab.summary = $('<dd class="summary"></dd>')
     )
   );
   return tab;