function init ( )
{
  timeDisplay = document.createTextNode ( "" );
  document.getElementById("clock").appendChild ( timeDisplay );
}

function updateClock ( )
{
  var currentTime = new Date ( );

  var currentHours = currentTime.getHours ( );
  var currentMinutes = currentTime.getMinutes ( );
  var currentSeconds = currentTime.getSeconds ( );
  var currentMiliSeconds = currentTime.getMilliseconds ( );

  // Pad the minutes and seconds with leading zeros, if required
  currentMinutes = ( currentMinutes < 10 ? "0" : "" ) + currentMinutes;
  currentSeconds = ( currentSeconds < 10 ? "0" : "" ) + currentSeconds;
  currentMiliSeconds = ( currentMiliSeconds < 10 ? "00" : "" ) + currentMiliSeconds;
  currentMiliSeconds = ( currentMiliSeconds < 100 ? "0" : "" ) + currentMiliSeconds;

  // Choose either "AM" or "PM" as appropriate
// *** var timeOfDay = ( currentHours < 12 ) ? "AM" : "PM";

  // Convert the hours component to 12-hour format if needed
//***  currentHours = ( currentHours > 12 ) ? currentHours - 12 : currentHours;

  // Convert an hours component of "0" to "12"
//***  currentHours = ( currentHours == 0 ) ? 12 : currentHours;

  // Compose the string for display
  var currentTimeString = currentHours + ":" + currentMinutes + ":" + currentSeconds + "." + currentMiliSeconds;

  // Update the time display
  document.getElementById("clock").firstChild.nodeValue = currentTimeString;
}