function countdown() {

	var examtime = new Date(2008,11,7,13,0);
	var now = new Date(); 

  var difference = examtime.getTime() - now.getTime();

  var daysDifference = Math.floor(difference/1000/60/60/24);
  difference -= daysDifference*1000*60*60*24
  var hoursDifference = Math.floor(difference/1000/60/60);
  difference -= hoursDifference*1000*60*60
  var minutesDifference = Math.floor(difference/1000/60);
  difference -= minutesDifference*1000*60
  var secondsDifference = Math.floor(difference/1000);

	document.getElementById('days').innerHTML = daysDifference;
	document.getElementById('hours').innerHTML = hoursDifference;
	document.getElementById('minutes').innerHTML = minutesDifference;
	document.getElementById('seconds').innerHTML = secondsDifference;
}