function countDown(){
var tiempo = document.getElementById('contador');
	toSecond=toSecond-1;
	if(toSecond<0){
		toSecond=59;
		toMinute=toMinute-1;
	}

	if(toMinute<0){
		toMinute=59;
		toHour=toHour-1;
	}

	if(toHour<0){
		toHour = 0;
		toMinute = 0;
		toSecond = 0;
		tiempo.innerHTML = toHour+'0:'+toMinute+'0:0'+toSecond;
	}else{
		setTimeout("countDown()",1000);
	}
	
	tiempo.innerHTML = toHour+':'+toMinute+':'+toSecond;
}