function getRadioValue (radioButtonOrGroup) {
  var buttonsLength = radioButtonOrGroup.length;
  if (buttonsLength) { // group
    for (var b = 0; b < buttonsLength; b++)
      if (radioButtonOrGroup[b].checked)
        return radioButtonOrGroup[b].value;

  }
  else if (radioButtonOrGroup.checked)
    return radioButtonOrGroup.value;
  return null;
}
function noenter() {
  return !(window.event && window.event.keyCode == 13); 
  }