Compte a rebours non visible dans page site ?

Bonjour,

J'ai un script qui semble fonctionner mais qui ne s'affiche pas dans la page de mon site.
Est-ce que qqn pourrait m'aider a verifier si le script est correctement redige ou s'il y a des modif a apporter ?

Merci par avance pour votre support!

Voici le script en question :

<SCRIPT type=text/javascript>
//######################################################################################
// Author: ricocheting.com
// For: public release (freeware)
// Date: 4/24/2003 (update: 6/26/2009)
// Description: displays the amount of time until the "dateFuture" entered below.


// NOTE: the month entered must be one less than current month. ie; 0=January, 11=December
// NOTE: the hour is in 24 hour format. 0=12am, 15=3pm etc
// format: dateFuture = new Date(year,month-1,day,hour,min,sec)
// example: dateFuture = new Date(2003,03,26,14,15,00) = April 26, 2003 - 2:15:00 pm

dateFuture = new Date(2010,11,10,15,58,27);
dateNow = new Date();
dateFuture.setDate(dateNow.getDate()+8);//sets day of month
dateFuture.setFullYear(dateNow.getFullYear());//Sets year (four digits)
dateFuture.setMonth(dateNow.getMonth());//sets month (from 0-11)

// TESTING: comment out the line below to print out the "dateFuture" for testing purposes
//document.write(dateFuture +"<br />");


//###################################
//nothing beyond this point
function GetCount(){

dateNow = new Date(); //grab current date
amount = dateFuture.getTime() - dateNow.getTime(); //calc milliseconds between dates
delete dateNow;

// time is already past
if(amount < 0){
document.getElementById('countbox').innerHTML="Cette vente est terminée !";
}
// date is still good
else{
days=0;hours=0;mins=0;secs=0;out="";

amount = Math.floor(amount/1000);//kill the "milliseconds" so just secs

days=Math.floor(amount/86400);//days
amount=amount%86400;

hours=Math.floor(amount/3600);//hours
amount=amount%3600;

mins=Math.floor(amount/60);//minutes
amount=amount%60;

secs=Math.floor(amount);//seconds

if(days != 0){out += days +" jour"+((days!=1)?"s":"")+", ";}
if(days != 0 || hours != 0){out += hours +" heure"+((hours!=1)?"s":"")+", ";}
if(days != 0 || hours != 0 || mins != 0){out += mins +" minute"+((mins!=1)?"s":"")+", ";}
out += secs +" secondes";
document.getElementById('countbox').innerHTML=out;

setTimeout("GetCount()", 1000);
}
}

window.onload=GetCount;//call when everything has loaded

</script>
<div id="countbox"></div>