var gameDate =  document.getElementById("cDown").innerHTML; 
var countActive = true;
var countStepper = -1;
var leadingZero = true;
var displayFormat = "%%D%% : %%H%% : %%M%% : %%S%%";
var targetMessage = "Game On!";

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("cDown").innerHTML = targetMessage;
    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("cDown").innerHTML = DisplayStr;
  if (countActive)
    setTimeout("CountBack(" + (secs+countStepper) + ")", SetTimeOutPeriod);
}

countStepper = Math.ceil(countStepper);
if (countStepper == 0)
  countActive = false;
var SetTimeOutPeriod = (Math.abs(countStepper)-1)*1000 + 990;
var dthen = new Date(gameDate);
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);