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

function countBack(secs, SetTimeOutPeriod, CountStepper) {
  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+","+CountStepper+")", SetTimeOutPeriod);
}

function runCounter(){
	TargetDate = "04/30/2013 12:00 PM";
	CountActive = true;
	CountStepper = -1;
	LeadingZero = true;
	DisplayFormat = "%%D%% Dias, %%H%% Horas, %%M%% Minutos and %%S%% Segundos";
	FinishMessage = "Pronto!";

	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, SetTimeOutPeriod, CountStepper);
}