var showRatingDiv = function ( div_id ) {
  var div = new YAHOO.util.Element(div_id);
  div.setStyle('display','block');

}

  var setRatingValue = function ( form_id, rating_class, value ) {
    var el = new YAHOO.util.Element(form_id);
    var items = el.getElementsByClassName(rating_class); 
    for (i = 0; i < items.length; i++) {
      if (items[i].value == value) {
	items[i].checked = true ;
      } else {
	items[i].checked = false ;
      }
    }

  }