function onError(xhr) {
  if (xhr.status == 401) {
    showNeedsLoginMsg();
  } else {
    showError(xhr);
  }
}

function showNeedsLoginMsg() {
  if (confirm("You need to be logged in the instance agent to perform this action")) {
    var params = $.param({ redirect_to: window.location.href });
    window.location.href = agentLoginUrl + "?" + params;
  }
}
