function showClock()
{
	var clock=new Date();
	var hours=clock.getHours();
	var minutes=clock.getMinutes();
	var seconds=clock.getSeconds();
	// for a nice disply we'll add a zero before the numbers between 0 and 9
	if (hours<10){
	hours="0" + hours;
	}
	if (minutes<10){
	minutes="0" + minutes;
	}
	if (seconds<10){
	seconds="0" + seconds;
	}
	document.getElementById('clock').innerHTML=hours+":"+minutes+":"+seconds;
	t=setTimeout('showClock()',500);
	/* setTimeout() JavaScript method is used to call showClock() every 1000 milliseconds (that means exactly 1 second) */
}