/*
Author: Robert Hashemian
http://www.hashemian.com/

You can use this code in any manner so long as the author's
name, Web address and this disclaimer is kept intact.
********************************************************
Usage Sample:
*/


TargetDate = "10/01/2010 09:00 AM";
CountActive = true;
CountStepper = -1;
LeadingZero = true;
DisplayDays = "%%D%%";
DisplayHours = "%%H%%";
DisplayMinutes = "%%M%%";
DisplaySeconds = "%%S%%";

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("days").innerHTML = "00";
	document.getElementById("hours").innerHTML = "00";
	document.getElementById("minutes").innerHTML = "00:00";
    return;
  }
  
  DisplayNumDays = DisplayDays.replace(/%%D%%/g, calcage(secs,86400,100000));
  DisplayNumHours = DisplayHours.replace(/%%H%%/g, calcage(secs,3600,24));
  DisplayNumMinutes = DisplayMinutes.replace(/%%M%%/g, calcage(secs,60,60));
  DisplayNumSeconds = DisplaySeconds.replace(/%%S%%/g, calcage(secs,1,60));

  document.getElementById("days").innerHTML = DisplayNumDays;
  document.getElementById("hours").innerHTML = DisplayNumHours;
  document.getElementById("minutes").innerHTML = DisplayNumMinutes + ":" + DisplayNumSeconds;
  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(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);