var y = 0; 
var h = 114;
var i = 1;

var e = 4;
var d = 5000;

function scroll_comments(){
  if ((y < (h * i)) && (i < e)) {
    y = y + 2;
    document.getElementById('comments').scrollTop = y;
    window.setTimeout('scroll_comments()',50);
  }
  else {
    if (i < e){
      i = i + 1;
      window.setTimeout('scroll_comments()',d);
    }
    else {
      y = 0;
      i = 1;
      window.setTimeout('scroll_comments()',d);
    }
  }
}