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

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("<div id='cntdwn' style='background-color:"+backcolor+";color:"+forecolor+"'></div>");
}

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);