Excluding forum(s) in New Posts

[Baldilocks]

How would I change this template so that I can exclude a forum or two?

PHP Code:

$how_last = 10; // Wieviel Themen sollen angezeigt werden?

$vbulletin->input->clean_array_gpc('p', array(
        'limits'=> TYPE_INT
));

switch($vbulletin->GPC['limits'])
{
    case 10:
        $max = 10;
    ;break;
    case 20;
        $max = 20;
    ;break;
    case 30:
        $max = 30;
    ;break;
    default:
    $max =& $how_last;
}

$exc = "";
$forumpermissions = array();
foreach($vbulletin->forumcache AS $forum)
{
        $forumpermissions[$forum["forumid"]] = fetch_permissions($forum['forumid']);

        if ((!($forumpermissions[$forum["forumid"]] & $vbulletin->bf_ugp_forumpermissions['canview']) AND
             !$vbulletin->options['showprivateforums']) OR
             !($forumpermissions[$forum["forumid"]] & $vbulletin->bf_ugp_forumpermissions['canviewothers']))
        {
                $exc .= "'" . ',' . "'" . $forum['forumid'];
        }
}
unset($forum);
$whereit = ",'$exc'";



$last_threads_sql = $db->query_read_slave("
        SELECT 
        thread.threadid, thread.open, thread.visible, thread.title,
        thread.lastpost, thread.forumid, thread.dateline, thread.lastposter
        " . (($vbulletin->options['threadmarking'] AND $vbulletin->userinfo['userid']) ? ", threadread.readtime AS threadread" : "") . "
        FROM " . TABLE_PREFIX . "thread AS thread
        " . (($vbulletin->options['threadmarking'] AND $vbulletin->userinfo['userid']) ? " LEFT JOIN " . TABLE_PREFIX . "threadread AS threadread ON (threadread.threadid = thread.threadid AND threadread.userid = " . $vbulletin->userinfo['userid'] . ")" : "") . "
             WHERE forumid NOT IN (''$whereit)
             AND thread.open != 10 AND thread.visible = 1
        ORDER BY thread.lastpost DESC 
        LIMIT 0, $max
");

while($last_w = $db->fetch_array($last_threads_sql))
{

        if ($vbulletin->options['threadmarking'] AND $vbulletin->userinfo['userid'])
        {
        $foruminfo['forumreads'] = $vbulletin->forumcache["$last_w[forumid]"]['forumread'];
        $lastreads_new = max($foruminfo['forumreads'], TIMENOW - ($vbulletin->options['markinglimit'] * 86400));
        }else{
        $bbforumviews = intval(fetch_bbarray_cookie('forum_view', $last_w['forumid']));
        $lastreads_new = max($bbforumviews, $vbulletin->userinfo['lastvisit']);
        }
    if (!$lastreads_new)
    {
        $lastreads_new  = $vbulletin->userinfo['lastvisit'];
    }

    if ($last_w['lastpost'] > $lastreads_new)
        {
            if ($vbulletin->options['threadmarking'] AND $last_w['threadread'])
        {
                $threadviews = $last_w['threadread'];
        }else{
                $threadviews = intval(fetch_bbarray_cookie('thread_lastview', $last_w['threadid']));
        }

        if ($last_w['lastpost'] > $threadviews)
        {
                $show['gotonewposts'] = true;
        }else{
                $show['gotonewposts'] = false;
        }
    }else{
                $show['gotonewposts'] = false;
    }

        // Optional zu aktivieren // vor $last_w entfernen

        //$last_w['date'] = vbdate($vbulletin->options['dateformat'], $last_w['lastpost'], true); //Datum
        //$last_w['time'] = vbdate($vbulletin->options['timeformat'], $last_w['lastpost']);       //Uhrzeit

        $last_class = exec_switch_bg();
        $last_w['trimmedtitle'] = fetch_trimmed_title($last_w['title'], $vbulletin->options['lastthreadchars']);
    eval('$last_threads .= "' . fetch_template('forumhome_last_threads') . '";');
}
$db->free_result($last_threads_sql);
unset($whereit, $last_threads_sql, $last_w);