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

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);
}

if (typeof(TargetDate)=="undefined")
  var TargetDate = "03/01/2010 6:00 PM GMT+0300";
if (typeof(DisplayFormat)=="undefined")
  var DisplayFormat = "%%D%%д : %%H%%ч : %%M%%м : %%S%% с";
if (typeof(CountActive)=="undefined")
  var CountActive = true;
if (typeof(FinishMessage)=="undefined")
  var FinishMessage = "Ура! Проверяем результаты :)";
if (typeof(CountStepper)!="number")
  var CountStepper = -1;
if (typeof(LeadingZero)=="undefined")
  var 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)
  var ddiff = new Date(dnow-dthen);
else
  var ddiff = new Date(dthen-dnow);
var gsecs = Math.floor(ddiff.valueOf()/1000);