function validateGroupId(groupId, submitButtonName) {
  //alert('validateGroupId: ' + groupId);
  var submitButton = document.getElementById(submitButtonName);
  if (submitButton==null)
    return;
  if ( groupId!=null && groupId.length>0 && groupId!='0')
    submitButton.disabled = false;
  else
    submitButton.disabled = true;
}