function isInAPopup() {
    return window.opener != null;
  }

  function isInAFrame() {
    return (window.parent != window);
  }

  function isAtSfTop() {
    return (window.parent == window) || (window.name == 'comfriends_mainframe');
  }

  function logout() {
    if (isInAPopup()) {
      window.opener.logout();
      window.close();
    }else if (isAtSfTop()) {
      window.location.href = '/payment_v2/logout.php';
    }else if (isInAFrame()) {
      window.parent.location.href = '/payment_v2/logout.php';
    }
  }

  function return_to_my_home() {
    if (isInAPopup()) {
      window.opener.logout();
      window.close();
    }else if (isAtSfTop()) {
      window.location.href = '/payment_v2/redirect.php';
    }else if (isInAFrame()) {
      window.parent.location.href = '/payment_v2/redirect.php';
    }
  }