function login_overlay_menu() {
  $items['login-overlay'] = array(
    'title' => t('Sign in'),
    'page callback' => 'login_overlay_callback',
    'page arguments' => array(),
    'type' => MENU_CALLBACK,
    'access callback' => TRUE,
  );
  return $items;
}

function login_overlay_callback($js = TRUE){
    ctools_include('modal');
    ctools_include('ajax');
    $form_state = array(
      'ajax' => TRUE,
    );
    $output = ctools_modal_form_wrapper('login_overlay_form', $form_state);
    if (isset($_GET['destination'])) {
        $output[] = login_overlay_redirect($_GET['destination']);
    }
    else {
        $output[] = ctools_ajax_command_reload();
    }
    print ajax_render($output);
}

function login_overlay_redirect($path) {
  global $user;
  if (isset($languages[$user->language])) {
    $options = array('language' => $languages[$user->language]);
  }
  return ctools_ajax_command_redirect($path, 0, $options);
}

/**
* Implements hook_user_login().
*/
function my_module_user_login(&$edit, $account) {
 // $edit is empty with one time login
 if (!empty($edit)) {
   $_GET['destination'] = 'some-url';
 }
 // Or the form id is the password reset form
 if ($_POST['form_id'] != 'user_pass_reset') {
  $_GET['destination'] = 'some-url';
 }
}