function printScreen() {
  scherm = window.open("","printScreen","width=500,height=500,history=yes,resizable=no,status=no,scrollbars=yes,menubar=yes,toolbar=no,location=no,directories=no");
  scherm.focus();
  return false;
}

function printHelpdesk() {
  schermHD = window.open("","printHelpdesk","width=640,height=500,history=yes,resizable=no,status=no,scrollbars=yes,menubar=yes,toolbar=no,location=no,directories=no");
  schermHD.focus();
  return false;
}