Probleem

<?php
    ob_start();
    session_start();

    $spelnaam = $_GET['game'];
    $speler = $_SESSION['speler'];
?>
<html>
  <head>
<?php
    if(file_exists("instellingen.php")){
        require("instellingen.php");
    }
    else{
        exit("De server kan het bestand \"instellingen.php\" niet vinden!");
    }

    if($_SERVER['REQUEST_METHOD'] == "POST"){
        header("location: ./?game=".$_POST['game']."");
    }

    function changevalue($field, $value){
        return "document.getElementById('".$field."').innerHTML = '".$value."';";
    }

    function reload($game){
        $query = mysql_query("SELECT * FROM BKEE_".$game."");
        while($open = mysql_fetch_array($query)){
            $vA = $open['v1']; $vB = $open['v2']; $vC = $open['v3'];
            $vD = $open['v4']; $vE = $open['v5']; $vF = $open['v6'];
            $vG = $open['v7']; $vH = $open['v8']; $vI = $open['v9'];
        }
        return  "".changevalue("v1", $vA)."".changevalue("v2", $vB)."".changevalue("v3", $vC)."".changevalue("v4", $vD)."".changevalue("v5", $vE)."".changevalue("v6", $vF)."".changevalue("v7", $vG)."".changevalue("v8", $vH)."".changevalue("v9", $vI)."";
    }
?>
    <title><?php echo $config['title']; if(isset($spelnaam)){ echo " | "; echo $spelnaam; } ?></title>
  </head>
  <body>
    <center>
<?php
    if(!isset($spelnaam)){
?>
    <h1><u><?php echo $config['title']; ?></u></h1>
    Hoi! Vul hieronder het spelnaam in waar je naartoe wilt.<br />Het spel moet al wel bestaan!!<br /><br />
    <form name="join" id="join" method="post" action="<?php echo htmlentities($_SERVER['REQUEST_URI']); ?>" style="border: 1px darkblue solid;margin:15px;padding:15px;width:500px;">
      <input type="text" id="game" name="game" value="Demo" onclick="this.value=''" onkeyup="document.getElementById('gbutt').value=this.value" /><br />
      Ga nu naar het spel: <input type="submit" name="gbutt" id="gbutt" value="Demo" />
    </form>
<?php
    }
    else{
        echo "<script>setInterval(\"".reload($spelnaam)."\", '500');</script>";
?>
    <h1><u><?php echo $config['title']; ?> | <?php echo $spelnaam; ?></u></h1><br /><br />
    <table border="1" cellpadding="30" cellspacing="30">
      <td><div id="v1">&nbsp;</div></td><td><div id="v2">&nbsp;</div></td><td><div id="v3">&nbsp;</div></td>
        <tr></tr>
      <td><div id="v4">&nbsp;</div></td><td><div id="v5">&nbsp;</div></td><td><div id="v6">&nbsp;</div></td>
        <tr></tr>
      <td><div id="v7">&nbsp;</div></td><td><div id="v8">&nbsp;</div></td><td><div id="v9">&nbsp;</div></td>
    </table>
<?php
    }
?>
    </center>
  </body>
</html>