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("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'></span>");
}


if (typeof(BackColor)=="undefined") {
	BackColor = "white";
}

if (typeof(ForeColor)=="undefined") {
	ForeColor= "grey";
}

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);