function rate(rating, direction, id){
  var ra  = document.getElementById('rnum_' + id);
  var dao = document.getElementById('thumb_up_' + id);
  var dau = document.getElementById('thumb_down_' + id);
  
  if(direction=="up"){
    var value = rating+1;
    dao.className = "thumb thumb_up_select";
    dau.className = "thumb thumb_down_disabled";
    ajaxRequest("scripts/rate.php?i="+id+"&d=p",1);
  }else if(direction=="down"){
    var value = rating-1;
    dao.className = "thumb thumb_up_disabled";
    dau.className = "thumb thumb_down_select";
    ajaxRequest("scripts/rate.php?i="+id+"&d=m",1);
  }
  ra.innerHTML = value;
  dao.href  = 'javascript:void();';
  dau.href  = 'javascript:void();';
  
  if(value<0){
    var rstyle  = "red";
  }else if(value>0){
    var rstyle  = "green";
  }
  ra.style.color = rstyle;
}