iam stuck with my modification

[vbmechanic]

Well I don't know where this code is going, so I don't know if it has access to a current $threadinfo... if it does, this would work:

// ############################### start do set on frontpage ###############################
 if ($_POST['onfrontpage'] != $threadinfo['onfrontpage'])
 {
 	$DB_site->query("UPDATE " . TABLE_PREFIX . "thread SET onfrontpage = $_POST['onfrontpage'] WHERE threadid = $threadid");
 
 	$_REQUEST['forceredirect'] = 1;
 	$url = "showthread.php?$session[sessionurl]t=$threadid";
 	eval(print_standard_redirect('redirect_openclose'));
 
 }