var times=history.length;

if (times==6 || times==11 || times==16 || times==21 || times==26 || times==31 || times==36 || times==41 || times==46 || times==51)
  {
  document.write("* Hvala Vam što ste pogledali više od " + (times-1)+ " stranica (od ukupno 52). *");
  }