<html>
  <body>
    <form action="script.htm" method="POST">
      <input type=hidden name="Screen" value="1">

      Screen 1<br>
      <input type=submit name="Command" value="Start" onClick="document.forms[0].Command.action = 'Start'">
      <input type=submit name="Command" value="Next" onClick="document.forms[0].Command.action = 'Next'">
    </form>
    </body>
  </html>