function ProcessDocumentRating(documentId, userId, IP, rating,  itemId) {
  RatingService.ProcessDocumentRating(documentId, userId, IP, rating, OnProcessComplete, OnProcessError, itemId);
}

function OnProcessComplete(result, itemId) {
    alert(result.Message);
    var span = $get(itemId + '-span');
    span.title = result.RatingText;
    var li = $get(itemId + '-li');
    li.innerText = result.RatingText;
    li.style.width = result.Percents + '%';
}

function OnProcessError(result) {
  alert(result.Message);
}