function tick() {

  var hours, minutes, seconds, ap;
  var intHours, intMinutes, intSeconds;
  var today;

  today = new Date();

  intHours = today.getHours();
  intMinutes = today.getMinutes();
  intSeconds = today.getSeconds();

  hours = intHours+":";

  if (intMinutes < 10) {
     minutes = "0" + intMinutes + ":";
  } else {
     minutes = intMinutes + ":";
  }

  if (intSeconds < 10) {
     seconds = "0" + intSeconds + " ";
  } else {
     seconds = intSeconds + " ";
  }

  timeString = hours + minutes + seconds;

  document.getElementById("Clock").innerHTML = timeString;

  window.setTimeout("tick();", 100);
}