--- template.php	2009-10-02 11:08:43.000000000 -0400
+++ template.php	2009-10-02 11:09:51.000000000 -0400
@@ -100,13 +100,23 @@
  * Duplicate of theme_menu_local_tasks() but adds clear-block to tabs.
  */
 function zen_menu_local_tasks() {
+
   $output = '';
 
-  if ($primary = menu_primary_local_tasks()) {
-    $output .= '<ul class="tabs primary clear-block">' . $primary . '</ul>';
-  }
-  if ($secondary = menu_secondary_local_tasks()) {
-    $output .= '<ul class="tabs secondary clear-block">' . $secondary . '</ul>';
+  if (module_exists('ctools')) { //conditionally enable ctools tabs if ctools is installed
+    if ($primary = ctools_menu_primary_local_tasks()) {
+      $output .= '<ul class="tabs primary clear-block">' . $primary . '</ul>';
+    }
+    if ($secondary = ctools_menu_secondary_local_tasks()) {
+      $output .= '<ul class="tabs secondary clear-block">' . $secondary . '</ul>';
+    }
+  } else { //default to the regular zen way
+    if ($primary = menu_primary_local_tasks()) {
+      $output .= '<ul class="tabs primary clear-block">' . $primary . '</ul>';
+    }
+    if ($secondary = menu_secondary_local_tasks()) {
+      $output .= '<ul class="tabs secondary clear-block">' . $secondary . '</ul>';
+    }
   }
 
   return $output;