[PHP] Notice: Undefined variable

<?php 
error_reporting(E_ALL); 
include("http://www.astrostart.nl/phpBB2/config.php"); 

$limit = 10; //aantal topics
$letters = 28; //aantal letters voor strip
$forumpath = "http://www.astrostart.nl/phpBB2/"; 


function strippen($c,$letters){ 
    if(strlen($c) > $letters){ 
        $kort = substr($c, 0, $letters); 
        $laatste_spatie = strrpos($kort, ' '); 
        $kort = substr($kort, 0, $laatste_spatie); 
        $c = $kort.'...'; 
        return $c; 
    } 
    else{ 
        return $c; 
    } 
} 

$hostname = "127.0.0.1"; 
$user = "trostart"; 
$password = "klompen"; 
$database = "astrostart_nl_-_db"; 

mysql_connect($hostname, $user, $password) or die ("Kan geen verbinding maken met de host"); 
mysql_select_db($database) or die ("Kan de database niet openen"); 

$query = "SELECT topic_id,topic_title FROM phpbb_topics WHERE topic_status != 1 ORDER BY topic_last_post_id DESC LIMIT 0,".$limit; 

$res = mysql_query($query) or die(mysql_error()); 

while($data = mysql_fetch_assoc($res)){ 

   $topic_titel = strippen(stripslashes($data["topic_title"]), $letters); 
          
    echo "<font face=Verdana size=1 color=000000>- <a href=\"".$forumpath."viewtopic.php?t=".$data["topic_id"]."\" title=\"Forum topic :: ".$data["topic_title"]."\" onmouseover=\"window.status='Forum topic :: ".addslashes($data["topic_title"])."';return true\" target=\"_blank\">".$topic_titel."</a></font><br>"; 

} 
?>

<?php
#####################################
# SMe Poll                          #
# written by scriptme               #
# http://www.scriptme.com           #
#####################################
    if (!ini_get ("register_globals"))
    {//globals turned Off
    extract($HTTP_GET_VARS);
    extract($HTTP_POST_VARS);
    extract($HTTP_COOKIE_VARS);
    extract($HTTP_ENV_VARS);
    extract($HTTP_SERVER_VARS);
    }
function head() {
include('config.php');
echo "<table width=\"196\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\">
<tr><td bgcolor=\"$tableborder\">
<table width=\"196\" border=\"0\" cellpadding=\"0\" cellspacing=\"\" align=\"center\">
<tr><td bgcolor=\"$bgcolor\">";
}
function foot () {
echo "</td></tr></table></td></tr></table>";
}
function record($REMOTE_ADDR) {
include('config.php');
$fp=fopen("$ip_file", "a+");
fputs ($fp,$REMOTE_ADDR."][".time()."\n");
fclose($fp);
}
function check($REMOTE_ADDR) {
include('config.php');
global $valid;
$ip=$REMOTE_ADDR;
$data=file("$ip_file");
$now=time();
foreach ($data as $record) {
$subdata=explode("][",$record);
if ($now < ($subdata[1]+3600*$timeout)) {
if ($ip == $subdata[0]) {
$valid=0;
break;
}}}}
//##################### Save data ##############################

function save($answer){
global $answer;
include('config.php');
$data=file($datafile);
$subdata=explode("][",$data[$answer]);
$subdata[2]+=1;
$data[$answer]=implode("][", $subdata);
$data[$answer]=$data[$answer]."\n";
$fp=fopen($datafile,"w+");
$a=0;
do{
fputs($fp,$data[$a]);
$a++;
}while($a<count($data));
fclose($fp);
}
//########################## Show Form ############################
function form($PHP_SELF){
include('config.php');
head();
echo "<font size=\"$fontsize\" face=\"$font\" color=\"$textcolor\"><form method=\"post\" action=\"$PHP_SELF\"><div align=\"center\">";
$data=file($datafile);
$question=$data[0];
$nb_options=count($data)-1;
if ($use_image==1) echo "<b>$question</b><br><br>[img]\"$image_for_vote\"><b></b><br><br>";
else[/img]$question</b><br>";

for($nb=1;$nb <= $nb_options; $nb++){
$option=explode("][","$data[$nb]");
echo "<div align=\"left\"><input type=\"radio\" name=\"answer\" value=\"$nb\"> ";
echo "$option[0]<br></div>";
}
echo "<input type=\"hidden\" name=\"save\" value=\"yes\">";
echo "<p align=\"center\"><input type=\"submit\" name=\"Submit\" value=\"Stem\"></form></font></div>";
foot();
}
//################## Function to show results ########################
function results(){
include('config.php');
head();
$data=file($datafile);
$nb_answers=count($data);
$votes=0;
$a=1;
do{
$subdata=explode("][",$data[$a]);
$votes += $subdata[2];
$a++;
}while($a < $nb_answers);
$a=1;
$b="answerv";
$v=100/$votes;
if ($use_image==1) echo "<br><br><div align=\"center\"><b>$data[0]</b><br><br>($votes keer gestemd)<br>[img]\"$image_for_vote\"><b></b><br>";
else[/img]<font size=\"$fontsize\" face=\"$font\" color=\"$textcolor\"><b>$data[0]</b><br>($votes keer gestemd)</div><br>";

do{
$subdata=explode("][",$data[$a]);
$av = $subdata[2] * $v;
echo "<div align=\"left\"><font size=\"$fontsize\" face=\"$font\" color=\"$textcolor\">$subdata[0] -"; printf(" %01.1f", $av); echo"%<br>";
$p2v = 100-$av;
echo "[img]\"pollknop3.jpg\"[/img][img]\"$subdata[1]\"[/img][img]\"pollknop2.jpg\"[/img][img]\"pollknop.jpg\"[/img]<br><br>";
$a++;
} while ($a < $nb_answers);
echo "</div></br>";
foot();
}
//###################### Engine ####################################
check($REMOTE_ADDR);
if ($valid=="0"){ results();}
elseif ($action=="results") { results(); }
elseif ($save=="yes" && $valid!="0") { save($Answer); record($REMOTE_ADDR); results();}
elseif ($action=="save" && !empty($valid)) { results(); }
elseif ($action!="save" && $valid!="0"){ form($PHP_SELF); }
?>

elseif ($action=="results") { results(); }
elseif ($save=="yes" && $valid!="0") { save($Answer); record($REMOTE_ADDR); results();}
elseif ($action=="save" && !empty($valid)) { results(); }
elseif ($action!="save" && $valid!="0"){ form($PHP_SELF); }

<?php
include "test.php";

?>
            [img]"links4.jpg"[/img]<br>
            [img]"blokj.jpg"[/img]<br>
<?php
include "vote.php";

?>