first import

sites/all/modules/admin/includes/admin.menu.js

@@ -0,0 +1,65 @@
+(function($) {
+
+Drupal.behaviors.adminToolbarMenu = {};
+Drupal.behaviors.adminToolbarMenu.attach = function(context) {
+  if (jQuery().drilldown) {
+    $('#admin-toolbar div.admin-block:has(ul.menu):not(.admin-toolbar-menu)')
+      .addClass('admin-toolbar-menu')
+      .each(function() {
+        var menu = $(this);
+        var trail = '#admin-toolbar div.admin-tab.' + $(this).attr('id').split('block-')[1] + ' span';
+        var rootTitle = $(trail).text();
+
+        if ($('a:has(span.menu-description)', menu).size() > 0) {
+          menu.addClass('admin-toolbar-menu-hover');
+          $('a:has(span.menu-description)', menu).hover(
+            function() {
+              $('<a></a>')
+                .attr('class', $(this).attr('class'))
+                .addClass('menu-hover')
+                .addClass('overlay-exclude')
+                .append($('span.menu-description', this).clone())
+                .appendTo(menu)
+                .show();
+            },
+            function() {
+              $(menu)
+                .children('a.menu-hover')
+                .remove();
+            }
+          );
+        }
+
+        // Replace the standard trail click handler with one that only
+        // adjusts menu if the admin tab is active. Otherwise, switch
+        // to that admin tab.
+        menu.bind('refresh.drilldown', function() {
+          $(trail + ' a').unbind('click').click(function() {
+            if ($(this).parents('div.admin-tab').is('.admin-tab-active')) {
+              var settings = {'activeLink': $(this).data('original'), 'trail': trail};
+
+              // If the clicked link does not reference the current
+              // active menu, set it to be active.
+              if (settings.activeLink.siblings('ul.drilldown-active-menu').size() === 0) {
+                menu.drilldown('setActive', settings);
+                return false;
+              }
+              // Otherwise, pass-through and allow the link to be clicked.
+              return menu.drilldown('goTo', settings);
+            }
+            $(this).parents('div.admin-tab').click();
+            return false;
+          });
+        });
+
+        // Init drilldown plugin.
+        menu.drilldown('init', {
+          activePath: Drupal.settings.activePath,
+          trail: trail,
+          rootTitle: rootTitle
+        });
+      });
+  }
+};
+
+})(jQuery);