diff --git a/sites/all/modules/contrib/admin_menu/admin_menu.js b/sites/all/modules/contrib/admin_menu/admin_menu.js
index de0bb90..f3c841e 100644
--- a/sites/all/modules/contrib/admin_menu/admin_menu.js
+++ b/sites/all/modules/contrib/admin_menu/admin_menu.js
@@ -231,6 +231,16 @@ Drupal.admin.behaviors.hover = function (context, settings, $adminMenu) {
     );
   }
 
+  // Lock menus when their children are active.
+  $('ul.dropdown', $adminMenu).hover(
+    function () {
+      $(this).parent().closest('.dropdown').addClass('locked');
+    },
+    function () {
+      $(this).parent().closest('.dropdown').removeClass('locked');
+    }
+  );
+
   // Delayed mouseout.
   $('li.expandable', $adminMenu).hover(
     function () {
@@ -241,12 +251,28 @@ Drupal.admin.behaviors.hover = function (context, settings, $adminMenu) {
         .css({left: 'auto', display: 'block'})
         // Immediately hide nephew lists.
         .parent().siblings('li').children('ul').css({left: '-999em', display: 'none'});
+
+      var $list = $('> ul', this),
+        offset = $list.offset(),
+        position = $list.position(),
+        maxHeight = ($(window).innerHeight() - position.top),
+        height = $list.height();
+
+      // don't do any animation if list shorter than max
+      if (height > maxHeight) {
+        $('> ul', this).mousemove(function(e) {
+          var relativeY = ((e.pageY - offset.top) - position.top);
+          if (!$(this).hasClass('locked')) {
+            $(this).css("top", -relativeY);
+          }
+        });
+      }
     },
     function () {
       // Start the timer.
       var uls = $('> ul', this);
       this.sfTimer = setTimeout(function () {
-        uls.css({left: '-999em', display: 'none'});
+        uls.css({top: 'auto', left: '-999em', display: 'none'});
       }, 400);
     }
   );