Eigenes Template mit Form funktioniert nicht

<?php
/*
Template Name: Petition
*/
?>
<?php get_header(); ?>


    <div id="content" class="narrowcolumn">


    <?php if (have_posts()) : ?>


        <?php while (have_posts()) : the_post(); ?>


            <div class="post" id="post-<?php the_ID(); ?>">
                <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h2>
                <small><?php the_time('F jS, Y') ?> <!-- by <?php the_author() ?> --></small>


                <div class="entry">
                
                    <?php the_content('Read the rest of this entry &raquo;'); ?>
                </div>


<?PHP
$host='localhost';
$benutzer='xxx';
$pw='xxx';
$db='xxx';






$link = mysql_connect($host,$benutzer,$pw);
if (!$link)
    die('Keine Verbindung zur Datenbank!<br>');
mysql_select_db($db,$link)
or die ('Konnte Datenbank nicht öffnen:'.mysql_error().'<br />');






function printerror($err){
    echo '<strong>Fehler:</strong> '.$err.' <br />';
    return true;
}


if(isset($_POST['submit']))
{
    $waserror = false;
    if(strlen($_POST['vorname'])<2) 
        $waserror = printerror('Du hast keinen Vornamen angegeben!');
    if(strlen($_POST['vorname'])>20) 
        $waserror = printerror('Dein Vorname ist unmenschlich lang. :-)');
        if(strlen($_POST['nachname'])<2) 
        $waserror = printerror('Du hast keinen Nachnamen angegeben!');
    if(strlen($_POST['nachname'])>20) 
        $waserror = printerror('Dein Nachname ist unmenschlich lang. :-)');
    if(strlen($_POST['nachname'])>20) 
        $waserror = printerror('Dein Nachname ist unmenschlich lang. :-)');
        $regexe = "#(https?://)?(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:\d+)){3}))(?::(?:\d+))?)(?:/(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[;:@&=])*)(?:/(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[;:@&=])*))*)(?:\?(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[;:@&=])*))?)?#";
    if(strlen($_POST['url']>0) && !preg_match($regexe,$_POST['url']))
        $waserror = printerror('Die angegebene URL ist ung&uuml;ltig');
        
    if(strlen($_POST['mitteilung'])>50) 
        $waserror = printerror('Deine Mitteilung darf nicht l&auml;nger als 50 Zeichen sein');
        
    $query=mysql_query("SELECT * FROM ce_petition WHERE ip = '".$_SERVER['REMOTE_ADDR']."'");
    if(mysql_num_rows($query) > 0)
        $waserror = printerror('Du hast bereits deine Stimme abgegeben');
        
    if(!$waserror)
    {


        $vorname = mysql_real_escape_string($_POST['vorname']);
        $nachname = mysql_real_escape_string($_POST['nachname']);
        $url = mysql_real_escape_string($_POST['url']);
        $nachricht = mysql_real_escape_string($_POST['nachricht']);
        mysql_query("INSERT INTO ce_petition VALUES ('$vorname', '$nachname', '$url', '$nachname', '".$_SERVER['REMOTE_ADDR'].    "')");
    }
        


}         


$query=mysql_query("SELECT datum,vorname,nachname,url,nachricht FROM ce_petition ORDER BY datum DESC");
$anzahl=mysql_num_rows($query);
print ("<br />Es sind bereits <strong>$anzahl</strong> virtuelle Unterschirften eingegangen.");
echo '<br /> <br />';
print("<table><tr><th>Nr.</th><th>Datum</th><th>Name</th><th>Homepage</th><th>Nachricht</th>");


$nr=0;


while ($row=mysql_fetch_array($query))
{
$nr++;
$schnitt=number_format($row['schnitt'],0,'.','.');
$gesamt=number_format($row['gesamt'],0,'.','.');


print("<tr><td>$nr</td>\n");
print("<td>".$row['datum']."</td>\n");
print("<td>".$row['vorname']."</td>\n"); // todo nachname
print("<td>".$row['url']."</td>\n");
print("<td>".$row['nachricht']."</td>\n");
}


print("</tr>\n");
print("</table>");
mysql_close($link);
?>                
<br /><br />
<br /><br />
<br /><br />
 <p>
 <h2>Eintragen</h2>
 <br />
 <br />
 <form action="<?php $_SERVER['self']?>" method="post">
 <label for='vorname' style='float:left;width:100px;'>Vorname: </label>
 <input type='text' id='vorname' name='vorname' size='15'/><br />


 <label for='name' style='float:left;width:100px;'>Nachname: </label>
 <input type='text' id='name' name='name' size='15'/><br />
 <label for='homepage' style='float:left;width:100px;'>Homepage: </label>
 <input type='text' id='homepage' name='homepage'/><br/>
 <label for='mitteilung' style='float:left;width:100px;'>Mitteilung: </label>
 <textarea cols='23' rows='3' name='mitteilung' id='mitteilung'></textarea><br />
 <br />
 <br />
 <input type='submit' name='submit' value='abschicken'/>
 <input type='reset' value='zur&uuml;cksetzen'/>
 </p>
 </form>


                <p class="postmetadata"></p>
            </div>


        <?php endwhile; ?>


        <div class="navigation">
            <div class="alignleft"><?php next_posts_link('&laquo; Previous Entries') ?></div>
            <div class="alignright"><?php previous_posts_link('Next Entries &raquo;') ?></div>
        </div>


    <?php else : ?>


        <h2 class="center">Not Found</h2>
        <p class="center">Sorry, but you are looking for something that isn't here.</p>
        <?php include (TEMPLATEPATH . "/searchform.php"); ?>


    <?php endif; ?>


    </div>


<?php get_sidebar(); ?>


<?php get_footer(); ?>