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

function CountBack(secs) {
  if (secs < 0) {
    document.getElementById("cntdwnDays").innerHTML = DaysLeft;
    document.getElementById("cntdwnHours").innerHTML = HoursLeft;
    document.getElementById("cntdwnMinutes").innerHTML = MinutesLeft;
    document.getElementById("cntdwnSeconds").innerHTML = SecondsLeft;
    return;
  }
  
  DaysLeft = calcage(secs,86400,100000);
  HoursLeft = calcage(secs,3600,24);
  MinutesLeft = calcage(secs,60,60);
  SecondsLeft = calcage(secs,1,60);
    //document.getElementById("cntdwnDays").innerHTML = SecondsLeft;
    document.getElementById("cntdwnDays").innerHTML = DaysLeft;
    document.getElementById("cntdwnHours").innerHTML = HoursLeft;
    document.getElementById("cntdwnMinutes").innerHTML = MinutesLeft;
    document.getElementById("cntdwnSeconds").innerHTML = SecondsLeft;
  if (CountActive)
    setTimeout("CountBack(" + (secs+CountStepper) + ")", SetTimeOutPeriod);
}

if (typeof(BackColor)=="undefined")
  BackColor = "white";
if (typeof(ForeColor)=="undefined")
  ForeColor= "black";
if (typeof(TargetDate)=="undefined")
  TargetDate = "12/31/2020 5:00 AM";
if (typeof(CountActive)=="undefined")
  CountActive = true;
if (typeof(CountStepper)!="number")
  CountStepper = -1;
if (typeof(LeadingZero)=="undefined")
  LeadingZero = true;
if (typeof(DaysLeft)=="undefined") DaysLeft = true;
if (typeof(HoursLeft)=="undefined") HoursLeft = true;
if (typeof(MinutesLeft)=="undefined") MinutesLeft = true;
if (typeof(SecondsLeft)=="undefined") SecondsLeft = true;



CountStepper = Math.ceil(CountStepper);
if (CountStepper == 0)
  CountActive = false;
var SetTimeOutPeriod = (Math.abs(CountStepper)-1)*1000 + 990;
var dthen = new Date(TargetDate);
var dnow = new Date();
if(CountStepper>0)
  ddiff = new Date(dnow-dthen);
else
  ddiff = new Date(dthen-dnow);
gsecs = Math.floor(ddiff.valueOf()/1000);
CountBack(gsecs);