/*
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:

<script language="JavaScript">
var TargetDate = "12/31/2020 5:00 AM";
var BackColor = "palegreen";
var ForeColor = "navy";
var CountActive = true;
var CountStepper = -1;
var LeadingZero = true;
var DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
var FinishMessage = "It is finally here!";
</script>
<script language="JavaScript" src="http://scripts.hashemian.com/js/countdown.js"></script>
*/

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

function CountBack(secs) {
  if($('countdown') == undefined) return;
  if (secs < 0) {
    $('countdown').update(FinishMessage);
    return;
  }
  var 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));

  $('countdown').update(DisplayStr);
  if (CountActive) setTimeout("CountBack(" + (secs+CountStepper) + ")", SetTimeOutPeriod);
}

function putspan(backcolor, forecolor) {
 document.write("<span id='cntdwn' style='background-color:" + backcolor + 
                "; color:" + forecolor + "'></span>");
}

function setup_countdown() {
  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;
  SetTimeOutPeriod = (Math.abs(CountStepper)-1)*1000 + 990;
  var dthen = new Date(TargetDate);
  var dnow = new Date();
  ddiff = new Date(dnow-dthen);
  if(CountStepper>0)
    ddiff = new Date(dnow-dthen);
  else
    ddiff = new Date(dthen-dnow);
  var gsecs = Math.floor(ddiff.valueOf()/1000);
  CountBack(gsecs);
}