/*
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) {
	s = ((Math.floor(secs/num1))%num2).toString();
	if (LeadingZero && s.length < 2) s = "0" + s;

	return s;
//	return "<b>" + s + "</b>";
}

function CountBack(secs) {
	if (secs < 0) {
		document.getElementById("cntdwn").innerHTML = FinishMessage;
		return;
	}

	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));

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

function putspan(backcolor, forecolor) {
	document.write("<span id='cntdwn' style='background-color:" + backcolor + "; color:" + forecolor + "'></span>");
}

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(DisplayFormat)=="undefined")	DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
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;

putspan(BackColor, ForeColor);

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);