Valaki leírna egy visszaszámláló scriptet?

/*

Author: Robert Hashemian

[link]

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 = "2009/12/11 12:00";

BackColor = "palegreen";

ForeColor = "navy";

CountActive = true;

CountStepper = -1;

LeadingZero = true;

DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";

FinishMessage = "Boldog Karácsonyt!";

</script>

*/

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("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 0:00 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);