function showRating(id,n){

  for(i=1; i<=n; i++){
    document.getElementById("rating"+i).style.display = 'none';
    document.getElementById("r"+i).style.background = '#6D6D6D';
  }
  
  document.getElementById("rating"+id).style.display = 'block';
  document.getElementById("r"+id).style.background = '#565656';
  
}