function display_form($key, $str_month_name, $action) {
  global $PHP_SELF;

  echo "<form action=\"$PHP_SELF\"";;
  echo '  method="post">';
  echo '<input type="hidden"';
  echo '  name="action"';
  echo "  value=\"$action\">";
  echo '<input type="hidden" name="key"';
  echo "value=\"$key\">";
  echo '<table cellpadding="3">';
  echo '  <tr>';
  echo '    <td>Month Name:</td>';
  echo '  <td>';
  echo '    <input';
  echo '      type="text"';
  echo '    name="str_month_name"';
  echo "    value=\"$str_month_name\">";
  echo '  </td>';
  echo '  </tr>';
  echo '  <tr><td colspan="2">';
  echo '    <input type="submit" value="Submit">';
  echo '  </td></tr>';
  echo '</table>';
  echo '</form>';
}