function rateScheme(id, rating, divID, s_id) {
  var xhr = false;
  if (window.XMLHttpRequest) {
    xhr = new XMLHttpRequest();
    if (xhr.overrideMimeType) {
      xhr.overrideMimeType('text/html');
    }
  } else if (window.ActiveXObject) {
    try {
      xhr = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xhr = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e) {}
    }
  }
  
  var obj = document.getElementById(divID);
  
  if (xhr) {
    var qs = "rate.php?id="+id+"&rating="+rating+"&on_user="+s_id;
    
    xhr.open("GET", qs, true);
    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xhr.onreadystatechange = function() {
      if (xhr.readyState == 4 && xhr.status == 200) {
        obj.innerHTML = xhr.responseText;
      }
    }
    xhr.send(null);
  }
}