function validateCommentType(source,args) {
  var commentHolder = document.getElementById("commentTypes");
  var comments = commentHolder.getElementsByTagName("input");
  for(i=0; i<comments.length; i++) {
    if(comments[i].checked == true)
    {
      args.isValid = true;
      return;
    }
    args.isValid = false;
  }
} // validateCommentType