function GoCountdown(timestamp){
	var obj = document.getElementById("countdown");

	var now = new Date();
	now.setTime(timestamp);
	var begintime = new Date("December 24, 2008 22:00:00");
	var until = begintime.getTime()-now.getTime();
	var endtime = new Date("December 25, 2008 02:30:00");
	var from = endtime.getTime()-now.getTime();
	
	if(from < until){
		obj.innerHTML = 'Foute invoer, de eindtijd moet groter zijn dan de begintijd';
	}		
	
	if(until<0 && from>0){
		obj.innerHTML = 'Denderend Vet is begonnen!';
		var newtime = now.getTime()+2000;
		setTimeout("GoCountdown('"+newtime+"');",2000);
	}else if(from<0){
		obj.innerHTML = 'Denderend Vet Club Lub editie is afgelopen..';
	}else{
		var untilnew = until/1000;
		var days = Math.floor(untilnew/(60*60*24)).toString();
		var hours = Math.floor((untilnew/(60*60))%24).toString();
		var minutes = Math.floor((untilnew/(60))%60).toString();
		var seconds = Math.floor((untilnew)%60).toString();
		if(days.length == 1){ days = "0"+days; }
		if(hours.length == 1){ hours = "0"+hours; }
		if(minutes.length == 1){ minutes = "0"+minutes; }
		if(seconds.length == 1){ seconds = "0"+seconds; }
		obj.innerHTML = days+" dagen  "+hours+" uur  "+minutes+" minuten  en "+seconds+" seconden";	
		var newtime = now.getTime()+500;
		setTimeout("GoCountdown('"+newtime+"');",500);
	}

}