TargetDate = "1/11/2011 12:00 AM";
BackColor = "black";
ForeColor = "white";
CountActive = true;
CountStepper = -1;
LeadingZero = true;
DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
FinishMessage = "It is finally here!";

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' style='background-color:" + backcolor + "; color:" + forecolor + "'></span>");
}

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