/*
Author: Robert Hashemian
http://www.hashemian.com/

You can use this code in any manner so long as the author's
name, Web address and this disclaimer is kept intact.
********************************************************
Usage Sample:

<script language="JavaScript">
TargetDate = "12/31/2020 5:00 AM";
BackColor = "palegreen";
ForeColor = "navy";
CountActive = true;
CountStepper = -1;
LeadingZero = true;
DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
FinishMessage = "It is finally here!";
</script>
<script language="JavaScript" src="http://scripts.hashemian.com/js/countdown.js"></script>
*/

function calcage(secs, num1, num2) {
  if (num1 == 86400) {
	LeadingZero = false;
  } else {
	LeadingZero = true;
  }
  s = ((Math.floor(secs/num1))%num2).toString();
  if (LeadingZero && s.length < 2)
    s = "0" + s;
  return s;
}

function CountBack(secs, CountActive, CountStepper, SetTimeOutPeriod) {
	//alert(secs);
	if (secs < 0) {
		var cntdwn = document.getElementById("cntdwn");
			if (cntdwn === null)
			{
				return;
			}
			else
			{
				cntdwn.innerHTML = FinishMessage;
				return;
			}
	} else if (secs > 86400) {
		DisplayStr = DisplayFormat.replace(/%%D%%/g, calcage(secs,86400,100000));
		DisplayStr = DisplayStr.replace(/%%H%%/g, calcage(secs,3600,24));
		DisplayStr = DisplayStr.replace(/%%M%%/g, calcage(secs,60,60));
		DisplayStr = DisplayStr.replace(/%%S%%/g, calcage(secs,1,60));
	} else {
		DisplayStr = DisplayFormat.replace("%%D%% Days, ", '');
		DisplayStr = DisplayStr.replace(/%%H%%/g, calcage(secs,3600,24));
		DisplayStr = DisplayStr.replace(/%%M%%/g, calcage(secs,60,60));
		DisplayStr = DisplayStr.replace(/%%S%%/g, calcage(secs,1,60));
	}

  document.getElementById("cntdwn").innerHTML = DisplayStr;
  if (CountActive)
    setTimeout("CountBack(" + (secs+CountStepper) + "," + CountActive + "," + CountStepper + "," + SetTimeOutPeriod + ")", SetTimeOutPeriod);
}

function initCountdown() {
    if (typeof(TargetDate)=="undefined")
      TargetDate = "12/31/2020 5:00 AM";
    if (typeof(DisplayFormat)=="undefined")
      DisplayFormat = "%%D%% Days, %%H%%:%%M%%:%%S%%";
    if (typeof(CountActive)=="undefined")
      CountActive = true;
    if (typeof(FinishMessage)=="undefined")
      FinishMessage = "";
    if (typeof(CountStepper)!="number")
      CountStepper = -1;
    if (typeof(LeadingZero)=="undefined")
      LeadingZero = 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, CountActive, CountStepper, SetTimeOutPeriod);
}