var hours;
var minutes;
var seconds;
var timer=null;
function sClock()
{
  if(timer){clearInterval(timer);timer=null;}
  timer=setInterval("work();",1000);
}

function twoDigit(_v)
{
  if(_v<10)_v="0"+_v;
  return _v;
}

function work()
{
  if (!document.layers && !document.all && !document.getElementById) return;
  var runTime = new Date();
  var dn = "AM";
  var shours = hours;
  var sminutes = minutes;
  var sseconds = seconds;
  if (shours >= 12)
  {
    dn = "PM";
    shours-=12;
  }
  if (!shours) shours = 12;
  sminutes=twoDigit(sminutes);
  sseconds=twoDigit(sseconds);
  shours  =twoDigit(shours  );
  movingtime = ""+ shours + ":" + sminutes +":"+sseconds+"" + dn;
  if (document.getElementById)
    document.getElementById("timevalue").innerHTML=movingtime;
  else if (document.layers)
  {
    document.layers.timevalue.document.open();
    document.layers.timevalue.document.write(movingtime);
    document.layers.timevalue.document.close();
  }
  else if (document.all)
    timevalue.innerHTML = movingtime;

  if(++seconds>59)
  {
    seconds=0;
    if(++minutes>59)
    {
      minutes=0;
      if(++hours>23)
      {
        hours=0;
      }
    }
  }
}