Timer in HTML page by java script

Timer in HTML page by java script

<html>

<head>

var dt = null;

setTimeout(setTime, 100);

function setTime() {

if (dt == null)

dt = new Date();

var totalseconds = parseInt(((new Date()) - dt) / 1000, 10);

var hh = parseInt(totalseconds / (60 * 60), 10);

var mm = parseInt((totalseconds - (hh * 60 * 60)) / 60, 10);

var ss = parseInt(totalseconds - (hh * 60 * 60) - (mm * 60), 10);

document.getElementsByName("txttimer")[0].value = (hh > 9 ? hh : ('0' + hh)) + ":" + (mm > 9 ? mm : ('0' + mm)) + ":" + (ss > 9 ? ss : ('0' + ss));

setTimeout(setTime, 1000);

}

</script>

</head>

<body>

<input type="text" readonly="readonly" name="txttimer" style="text-align: center;

color: Blue; font-weight: bold; border: solid 1px red; padding: 5px; width: 100px;

height: 27px; margin: auto;" />

</div>

</body>

</html>