function BeginRequestHandler(sender, args) {
  //alert("Request_Start");
}

function PageLoadedHandler(sender, args) {
  //alert("Page_Loaded");
}

function EndRequestHandler(sender, args) {
  //alert("Request_End");
  if (args.get_error() != null /*undefined*/) {
    var errorMessage = "";
    if (args.get_response().get_statusCode() == "200") {
      errorMessage = args.get_error().message + "\n\n";
    }
    else {
      // the server wasn’t the problem...
      errorMessage = "An unknown error occurred... " + args.get_error().message + "\n\n";
    }

    if (args._response._xmlHttpRequest.responseText != null)
      errorMessage += args._response._xmlHttpRequest.responseText + "\n\n";
    // do something with the errorMessage here.
    // now make sure the system knows we handled the error.
    args.set_errorHandled(true);

    // // alert("EndRequestHandler error:\n" + errorMessage);
  }
  else {
    //alert("Request_End OK");
  }
}