function updateclock()
{
    var datetime = new Date();
	var year   = datetime.getFullYear();
	var month  = datetime.getMonth() + 1;
	var day    = datetime.getDate();
    var hour   = datetime.getHours();
    var minute = datetime.getMinutes();
    var second = datetime.getSeconds();

    month  = (month  < 10 ? "0" : "") + month;
    day    = (day    < 10 ? "0" : "") + day;
    hour   = (hour   < 10 ? "0" : "") + hour;
    minute = (minute < 10 ? "0" : "") + minute;
    second = (second < 10 ? "0" : "") + second;

    document.getElementById("clock").firstChild.nodeValue =
		hour + ":" + minute + ":" + second;
}