Untitled

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <meta http-equiv="content-type" content="text/html; charset=utf-8">
  <meta name="generator" content="PSPad editor, www.pspad.com">
  <title></title>
  </head>

  <body>
    <img src="koule.jpg">
    <script>
      var polomer = prompt("Zadej Poloměr: [mm]");
      var input = prompt("Zadej co chceš spočítat: (P = Povrch, O = Objem)");

      input = input.toLowerCase();

      if(input != null && input == "p"){
        var result = 4 * Math.PI * Math.pow(polomer, 2);
        document.write("Povrch: " + result +" mm2");
      }
      if(input != null && input == "o"){
        var result = (4/3) * Math.PI * Math.pow(polomer, 3);
        document.write("Objem: " + result +" mm3");
      }
    </script>
  </body>
</html>