var ImageNo = 0;
 var timerId;
 function ChangeNotesShown(){
  var html = "";
  ImageNo = (ImageNo + 1) % 20;
  var i;
  for (i = 0; i < 20; i++){
   if (i < ImageNo){
    html = html + '<img src="/images/ih_' + (i % 5) + '.jpg" alt="Meditation music." border = "0" width="32" height="32">';
   } else {
    html = html + '<img src="/images/White32_32.jpg" alt="Meditation music." border = "0" width="32" height="32">';
   }
  } 
  notes.innerHTML= html;
 }