Drupal - Go to error page

error.module

/*
 *  Redirect to error page
 * @param $site string Wether is for mobile or desktop site
 * @param $err_code int Error code
 * @param $path bool|string Force a path for redirection
 * @see http://www.kobashicomputing.com/creating-custom-drupal-6-error-pages
 * @return header()
 */
function _goto_error_page($site = 'mobile', $err_code = 404, $path = false) {
  $variable_name = ($site == 'mobile') ? "site_mobile_$err_code" : "site_$err_code";
  $location = $path ? $path : drupal_get_normal_path(variable_get($variable_name, $path));
  header('Location: /' . $location);
}