var SetTimeOutPeriod;
var dthen;
var dnow;

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) {
    eval(OnFinish);
    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(ElementID).innerHTML = DisplayStr;
  if (CountActive)
    setTimeout("CountBack(" + (secs+CountStepper) + ")", SetTimeOutPeriod);
}



function StartCounter() {
  
  if (typeof(DisplayFormat)=="undefined") DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
  if (typeof(CountActive)=="undefined") CountActive = true;
  if (typeof(CountStepper)!="number") CountStepper = -1;
  if (typeof(LeadingZero)=="undefined") LeadingZero = true;


  CountStepper = Math.ceil(CountStepper);
  if (CountStepper == 0) CountActive = false;
  SetTimeOutPeriod = (Math.abs(CountStepper)-1)*1000 + 990;
  
  dthen = new Date(TargetDate);
  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);

}