function realTime() {
  now=new Date();
  hour=now.getHours();
  min=now.getMinutes();
  sec=now.getSeconds();

if (min<=9) { min="0"+min; }
if (sec<=9) { sec="0"+sec; }
if (hour>12) { hour=hour-12; add="pm"; }
else { hour=hour; add="am"; }
if (hour==12) { add="pm"; }

document.timeForm.fieldClock.value = ((hour<=9) ? "0"+hour : hour) + ":" + min + ":" + sec + " " + add;

setTimeout("realTime()", 1000);
}