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

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