set a sound on a kitchen timer

<script>
vartimer1;// Declare the variable (timer ID) that stores the timer

// A function that calls the countdown function every 1000 milliseconds
function cntStart()
{
  document.timer.elements[2].disabled=true;
  timer1 = setInterval ("countDown(), 1000);
}

// timer stop function
function cntStop()
{
  document.timer.elements[2].disabled=false;
  clearInterval (timer1);
}

// Countdown function
function countDown()
{
  varmin = document.timer.elements[0].value;
  varsec = document.timer.elements[1].value;

  if((min=="")&&(sec=="")
  {
    alert("Please set the time!");
    reSet();
  }
  else
  {
    if(min=="")min=0;
    min = parseInt(min);

    if(sec=="")sec=0;
    sec = parseInt(sec);

    tmWrite(min*60+sec-1);
  }
}

// Function to write the remaining time
function tmWrite(int)
{
  int = parseInt(int);

  if(int<=0)
  {
    reSet();
    new Audio("hoge.mp3");
    play();
  }
    else
  {
    // Cut the remaining fraction by dividing int by 60
    document.timer.elements[0].value=Math.floor(int/60);
    // The number of seconds remaining is after int divided by 60
    document.timer.elements[1].value=int%60;
  }
}

// The function of returning the form to its initial state (reset)
function reset()
{
  document.timer.elements[0].value="0";
  document.timer.elements[1].value="0";
  document.timer.elements[2].disabled=false;
  clearInterval (timer1);
}  
</script>