var popup;
function open_popup (text) {
  if (popup) {
    popup.close();
  }
  
  popup = window.open('', 'popup', 'toolbar=0,location=0,directories=0,status=0,scrollbars=1,resizable=yes,width=340,height=350');
  popup.focus();
  popup.document.write(text);
  popup.document.close();
}

function open_popup_url (url) {
  if (popup) {
    popup.close();
  }
  
  popup = window.open(url, 'popup', 'toolbar=0,location=0,directories=0,status=0,scrollbars=1,resizable=yes,width=340,height=350');
  popup.focus();
}