function countdown(container,dateend)
{
		var hientai = new Date();
		var ketthuc=new Date(dateend);
		var today,target_day;
		today = hientai.getTime();
		target_day = ketthuc.getTime();
		ht=today.toString();
		kt=target_day.toString();
	    a=ht.substring(0,ht.length-3);
	    b=kt.substring(0,kt.length-3) ;
	    Today = a;
		Target_Date =b;
        Time_Left = Target_Date - Today;

        if (Time_Left > 0) {
            days = Math.floor(Time_Left / (60 * 60 * 24));
            Time_Left %= (60 * 60 * 24);
            hours = Math.floor(Time_Left / (60 * 60));
            Time_Left %= (60 * 60);
            minutes = Math.floor(Time_Left / 60);
            seconds = Time_Left % 60;
            if(document.getElementById(container)){
            document.getElementById(container).innerHTML = days + ' ngày ';
            document.getElementById(container).innerHTML += hours + ' giờ ';
            document.getElementById(container).innerHTML += minutes + ' phút ';
            document.getElementById(container).innerHTML += seconds + ' giây';
			setTimeout('countdown("' + container + '","'+dateend+'");', 1000);
            }
        }
        else {
            document.getElementById(container).innerHTML = 'Thời gian tham gia đã kết thúc!';
        }
}


// dat thoi gian
function settime()
{
	var ca="September 09, 2008 23:59:59";
	countdown("countdowncolauc1065",ca);	
}