function calcage(secs, num1, num2) {
  s = ((Math.floor(secs/num1))%num2).toString();
  if (s.length < 2)
    s = "0" + s;
  return s;
}

function CountBack(secs) {
  if (secs < 0) {
    return;
  }
  days2=calcage(secs,86400,10000);
  hours2=calcage(secs,3600,24);
  minutes2=calcage(secs,60,60);
  seconds2=calcage(secs,1,60);
  if (days2 != olddays) document.getElementById("days").innerHTML = days2;
  if (hours2 != oldhours) document.getElementById("hours").innerHTML = hours2;
  if (minutes2 != oldminutes) document.getElementById("minutes").innerHTML = minutes2;
  document.getElementById("seconds").innerHTML = seconds2;

  olddays=days2;
  oldhours=hours2;
  oldminutes=minutes2;

  setTimeout("CountBack(" + (secs-1) + ")", 1000);
}

var olddays=-1,oldhours=-1,oldminutes=-1;