fix working directory

templates/themes/rrdtool/cron.php

@@ -1,6 +1,6 @@
 <?php
 	$_SERVER = Array('REQUEST_URI' => '', 'HTTP_HOST' => '', 'SCRIPT_FILENAME' => '');
-	chdir('../../../');
+	chdir(str_replace('\\', '/', dirname(__FILE__)) . '/../../../');
 	
 	require 'inc/functions.php';
 	require 'inc/display.php';