private void wbGoogleMap_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
  wbGoogleMap.Document.Window.Error += new HtmlElementErrorEventHandler(Window_Error);
}
void Window_Error(object sender, HtmlElementErrorEventArgs e)
{
  e.Handled = true;
}

window.onerror = function(error, url, line) {
//      log(error + "url:" + url + "lineNo:" + line);
  return true;
}