Redirect after login is wrong how do I change it?

[touchclothing]

when I add something to the cart and then go to check out and it asks me to log in after I login it takes me to the front page not to the check out how can I fix that? It does the same thing when I create an account.

here is the codes I found.
/includes/modules/pages/login/header_php.php

$sql = "UPDATE " . TABLE_CUSTOMERS_INFO . "
              SET customers_info_date_of_last_logon = now(),
                  customers_info_number_of_logons = customers_info_number_of_logons+1
              WHERE customers_info_id = :customersID";

      $sql = $db->bindVars($sql, ':customersID',  $_SESSION['customer_id'], 'integer');
      $db->Execute($sql);
      $zco_notifier->notify('NOTIFY_LOGIN_SUCCESS');

      // restore cart contents
      $_SESSION['cart']->restore_contents();
      /*
      if ($_SESSION['cart']->count_contents() > 0) {
      zen_redirect(zen_href_link(FILENAME_CHECKOUT_SHIPPING));
      }

/includes/modules/pages/create_account_success/header_php.php

if (sizeof($_SESSION['navigation']->snapshot) > 0) {
  $origin_href = zen_href_link($_SESSION['navigation']->snapshot['page'], zen_array_to_string($_SESSION['navigation']->snapshot['get'], array(zen_session_name())), $_SESSION['navigation']->snapshot['mode']);
  $_SESSION['navigation']->clear_snapshot();
} else {
  $origin_href = zen_href_link(FILENAME_DEFAULT);
}

// redirect customer to where they came from if their cart is not empty and they didn't click on create-account specifically
if ($_SESSION['cart']->count_contents() > 0) {
  if ($origin_href != zen_href_link(FILENAME_DEFAULT)) {
    zen_redirect($origin_href);
  }
}