function select_checks(tform, check, name){
  var n=tform.elements.length;
  for (var i=0;i<n;i++){
    if (tform.elements[i].className == name){
      if (check) {
        tform.elements[i].checked = true;
      } else {
        tform.elements[i].checked = false;
      }
    }
  }
}