function chkLogin () {
  var elementF = document.getElementById("loginUserName");
  if (elementF.value == "") {
    elementF.style.background = "grey";
    elementF.focus();
    return false;
  } else { elementF.style.background = "white"; }

  elementF = document.getElementById("loginPassword");
  if (elementF.value == "") {
	elementF.style.background = "grey";
    elementF.focus();
    return false;
  } else { elementF.style.background = "white"; }

}