function newsletterDataSend()
{
  var frm = document.newslettersDataForm;
  var ok = false;
  for (var i = 0; i < frm.elements.length; i++)
    if (frm.elements[i].checked)
    {
      ok = true;
      break;
    }
  if (ok)
    ajaxPostText(newslettersApp + "?sessionId=" + sessionId + "&content=updateNewsletterData", "",
      serializeForm(frm), loadingSignalId,
      function() {
        if (validAccess())
        {
          if (frontEndPath == "compras3/")
            updatePanelContent("mainPanel", ajaxResponseText);
          else
          {
            updatePanelContent("middleRightPanel", ajaxResponseText);
            forcedNewslettersApp = false;
          }
        }
      }
    );
  else
    alert("Por favor, seleccioná al menos un tema.");
}