<script language='javascript' type='text/javascript'>
function fulltime () {
var time=new Date();
var newYear=new Date("jan,01,2011,00:00:00");
var totalRemains=(newYear.getTime()-time.getTime());

if (totalRemains>1){

var RemainsSec = (parseInt(totalRemains/1000));
var RemainsFullDays=(parseInt(RemainsSec/(24*60*60)));
var secInLastDay=RemainsSec-RemainsFullDays*24*3600;
var RemainsFullHours=(parseInt(secInLastDay/3600));
if (RemainsFullHours<10){RemainsFullHours="0"+RemainsFullHours};
var secInLastHour=secInLastDay-RemainsFullHours*3600;
var RemainsMinutes=(parseInt(secInLastHour/60));
if (RemainsMinutes<10){RemainsMinutes="0"+RemainsMinutes};
var lastSec=secInLastHour-RemainsMinutes*60;
if (lastSec<10){lastSec="0"+lastSec};

document.getElementById("RemainsFullDays").innerHTML=RemainsFullDays+"<span id='Rem'> дн</span>";
document.getElementById("RemainsFullHours").innerHTML=RemainsFullHours+"<span id='Rem'> час</span>";
document.getElementById("RemainsMinutes").innerHTML=RemainsMinutes+"<span id='Rem'> мин</span>";
document.getElementById("lastSec").innerHTML=lastSec+"<span id='Rem'> сек</span>";
setTimeout('fulltime()',10)
}

else{
document.getElementById("clock").innerHTML="C НОВЫМ ГОДОМ !!!";
}
}
</script>
<style type='text/css'>
#clou_xs {position:relative;width:200px;height:150px;padding:10px;}
#clock {height:150px;text-align:center;font-size:13px;}
#RemainsFullDays {position:absolute;top:50%;left:40%;font-size:25px;}
#RemainsFullHours {position:absolute;bottom:1px;left:40px;font-size:15px;}
#RemainsMinutes {position:absolute;bottom:1px;left:87px;font-size:15px;}
#lastSec {position:absolute;bottom:1px;left:135px;font-size:15px;}
#Rem {font-size:11px;font-weight:normal;}
</style>
<div id='clou_xs'>
<div id='clock'>
до нового года осталось:

<span id='RemainsFullDays'></span>
<span id='RemainsFullHours'></span>
<span id='RemainsMinutes'></span>
<span id='lastSec'></span>
</div>
</div>
<script language='javascript'>fulltime();</script>

Дату ставьте свою. меняйте вот эту строку:

var newYear=new Date("jan,01,2011,00:00:00");