윈도우 타이틀바에 현재 시간 출력하기

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var clocktext, timeday;
var pagetitle = document.title;
function scroll() {
today = new Date();
sec = today.getSeconds();
hr = today.getHours();
min = today.getMinutes();
// 12 Hour clock fix by Michael Mann (pres@manninc.com)
if (hr < 12) { timeday = " AM"; }
else { timeday = " PM"; }
if (hr > 12) hr = hr - 12;
if (hr <= 9) hr = "0" + hr;
if (min <= 9) min = "0" + min;
if (sec <= 9) sec = "0" + sec;
var clocktext = " - " + hr + ":" + min + ":" + sec + timeday;
clocktimer = setTimeout("scroll()", 1000);
document.title = pagetitle + clocktext;
}
if (document.all) scroll();
//  End -->
</script>