// Check whether IE4 or later.
var MS = navigator.appVersion.indexOf("MSIE");
window.isIE4 = (MS > 0) &&
(parseInt(navigator.appVersion.substring(MS + 5, MS + 6)) 
>= 4);

function lead0(val) {
// Add leading 0s when necessary.
return (val < 10) ? "0" + val.toString() : val;
}

function buildTime() {
var time = new Date();
var ampm = "AM";
var h = time.getHours();
// Fix military time and determine ampm.
if (h > 12) {
h = h - 12;
ampm = " PM";
}
return lead0(h) + ":" + lead0(time.getMinutes());
}

function tick() {
// Replace the clock's time with the current time.
document.all.clock.innerText = buildTime();
}