button probleem

<?php
include("global.php");
include("header.php");


if(functie() == "0"){
    begintabel("Fout!", $thema);
    echo "U dient ingelogd te zijn om een topic toe te voegen!";
    eindetabel($thema);
}
else{
    $sql234 = mysql_query("SELECT * FROM forum_sub_cats WHERE id='".$_GET['catid']."'")or die(mysql_error());
    $crew = mysql_fetch_array($sql234);
    begintabel("Nieuw topic", $thema);
    if($crew['gesloten'] == 1 && functie() < 6){
        echo "Dit forum is gesloten. Dit is alleen voor de crew!";
    }
    else{
        if(empty($_GET['catid']) OR !is_numeric($_GET['catid'])){
            echo "Er is <b>geen</b> (geldig) categorie id gevonden in de URL!";
        }
        else{
            if(isset($_POST['submit'])){
                if(empty($_POST['onderwerp'])){
                    echo "U heeft geen onderwerp ingevuld. <a href='javascript:history.go(-1)'>Ga terug</a>!";
                }
                elseif(empty($_POST['bericht'])){
                    echo "U heeft geen bericht ingevuld. <a href='javascript:history.go(-1)'>Ga terug</a>!";
                }
                else{
                    if($_GET['catid'] == 1){
                        $med = 1;
                    }
                    else{
                        $med = 0;
                    }
                    if($_POST['poll'] == "1"){
                        mysql_query("INSERT INTO forum_poll_tijdelijk (poster, bericht, onderwerp, catid, status) VALUES ('".$cookie_id."', '".$_POST['bericht']."', '".$_POST['onderwerp']."', '".$_GET['catid']."', '".$_POST['status']."')")or die(mysql_error());
                        header("Location: ".$site_url."poll_toevoegen.php");
                    }
                    else{
                        mysql_query("INSERT INTO forum (catid, onderwerp, bericht, datum, poster, bewerktdoor, mededeling, laatste_datum, ip) VALUES ('".$_GET['catid']."', '".$_POST['onderwerp']."', '".$_POST['bericht']."', NOW(), '".$cookie_id."', '".$cookie_id."', '".$med."', '".time()."', '".haalip()."')")or die(mysql_error());
                        $topic_id12 = mysql_insert_id();
                        mysql_query("UPDATE leden SET posts = posts + '1', forum_topics = forum_topics + '1' WHERE id='".$cookie_id."'")or die(mysql_error());
                        header("Location: ".$site_url."forum.php?actie=bekijken&topicid=".$topic_id12);
                    }
                }
            }
            else{
                echo "<form method='post' name='nieuwtopic' action='".$site_url."/nieuw_topic.php?catid=".$_GET['catid']."'>";
                echo "<table border='0' width='100%' cellspacing='0' cellpadding='0'>";
                echo "<tr>";
                echo "<td width='20%'><b>Onderwerp</b></td>";
                echo "<td width='80%'><input type='text' name='onderwerp' maxlenght='50'></td>";
                echo "</tr>";
                echo "<tr>";
                echo "<td width='20%'><b>Bericht</b></td>";
                echo "<td width='80%'>";
                echo button ("nieuwtopic", "bericht", $site_url);
                echo "<textarea name='bericht' rows='15' cols='50'></textarea>";
                echo smylie("nieuwtopic", "bericht", $site_url);
                echo "</td>";
                echo "</tr>";
                echo "<tr>";
                echo "<td width='20%'><b>Poll toevoegen?</b></td>";
                echo "<td width='80%'><input type='checkbox' name='poll' value='1'> <i>Aangevinkt is dat je een poll krijgt!</i></td>";
                echo "</tr>";
                echo "<tr>";
                echo "<td width='20%'></td>";
                echo "<td width='80%'><input type='submit' name='submit' value='Toevoegen'> <input type='reset' name='reset' value='Opnieuw'></td>";
                echo "</tr>";
                echo "</table>";
                echo "</form>";
            }
        }
    }
    eindetabel($thema);
}


include("footer.php");
?>