/* 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 = "05/02/2011 8:00 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("<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 = "05/02/2011 8:00 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);