presmetuvanje na volume

<!DOCTYPEhtml>
<html>
<head>
  <meta charset=utf-8/>
  <title>Title</title>
  <style>
    body{ padding-top: 30px;}
    label,input{display:block;}
  </style>
</head>
<body>
<p>Input radius value and get the volume of a sphere</p>
<form action="" method="post" id="MyForm">
  <label for="radius">Radius</label>
  <input type="text" name="radius" id="radius" required>
  <label for ="volume">Volume</label>
  <input type="text" name="volume" id="volume">
  <input type="submit" value="Calculate" id="submit">
</form>
</body>
</html>
<script>
  function Volume() {
    var v;
    var radius=document.getElementById('radius').value;
    radius=Math.abs(radius);
    v=(4/3)* Math.PI * Math.pow(radius,3);
    v=v.toFixed(4);
    document.getElementById('volume').value=v;
    return false;
  }
  window.onload = document.getElementById('MyForm').onsubmit=Volume;
</script>