echo '<form action="testdl.php" method="post">';
 
    $result = mysql_query("SELECT * FROM vote_alternatives WHERE vote_id='$id'");
    for ($x = 0; $x < mysql_num_rows($result); $x++)
    {
      $row = mysql_fetch_assoc($result);
      echo '<input type="radio" name="alternative" value="'.$row['alternative_id'].' onclick="this.form.submit()""> ';
      echo $row['alternative'].'<br>';
    }
 
    echo '<input type="submit" name="submit" value="vote">';
    echo '</form>';