--- old_plugins.php     Mon Mar  7 22:37:10 2005
+++ plugins.php Mon Mar  7 22:19:23 2005
@@ -11,6 +11,7 @@ if ( isset($_GET['action']) ) {
                }
                sort($current);
                update_option('active_plugins', $current);
+               do_action('plugin_activate', '');
                header('Location: plugins.php?activate=true');
        }

@@ -18,6 +19,7 @@ if ( isset($_GET['action']) ) {
                $current = get_settings('active_plugins');
                array_splice($current, array_search( $_GET['plugin'], $current), 1 ); // Array-fu!
                update_option('active_plugins', $current);
+               do_action('plugin_deactivate', '');
                header('Location: plugins.php?deactivate=true');
        }
 }