<input name="ServerTime" value="<%=DateTime.Now.ToLongTimeString()%>" >
<script language=javascript>
getServerTime();
function getServerTime()
{
var obj = document.all.ServerTime;
var h = parseFloat(obj.value.substring(0,2));
var m = parseFloat(obj.value.substring(3,5));
var s = parseFloat(obj.value.substring(6,8));
s = s + 1;
if (s == 60)
{
s = 0;
m = m + 1;
if (m == 60)
{
m = 0;
h = h + 1;
if (h == 24) h = 0;
}
}
if (h < 10) h = "0" + h;
if (m < 10) m = "0" + m;
if (s < 10) s = "0" + s;
obj.value = h + ":" + m + ":" + s;
setTimeout("getServerTime()",993)
}
</script>