redirect at article not working

just before the break; at the url there add

$check_query = tep_db_query("select articles_url from " . TABLE_ARTICLES_DESCRIPTION . " where articles_url = '" . tep_db_input($HTTP_GET_VARS['goto']) . "' limit 1");
if (tep_db_num_rows($check_query)) {
tep_redirect('http://' . $HTTP_GET_VARS['goto']);
}