Validating my code

Line 53, Column 58: document type does not allow element "th" here; assuming missing "tr" start-tag.

                    <th style="border-left: 0px;" class="tc0" scope="col"> </th>

Line 58, Column 9: XML Parsing Error: Opening and ending tag mismatch: thead line 52 and tr.

                </tr>

?
Line 59, Column 11: XML Parsing Error: Opening and ending tag mismatch: table line 51 and thead.

            </thead>

?
Line 69, Column 11: XML Parsing Error: Opening and ending tag mismatch: div line 50 and table.

            </table>

?
 Line 106, Column 6: XML Parsing Error: Opening and ending tag mismatch: body line 11 and div.

</div>

?
Line 108, Column 7: XML Parsing Error: Opening and ending tag mismatch: html line 4 and body.

</body>

<?php
/***********************************************************************

  Copyright (C) 2002-2005  Rickard Andersson (rickard@punbb.org)

  This file is part of PunBB.

  PunBB is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.

  PunBB is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  MA  02111-1307  USA

************************************************************************/


define('PUN_ROOT', './');
require PUN_ROOT.'include/common.php';


if ($pun_user['g_read_board'] == '0')
    message($lang_common['No view']);


$id = isset($_GET['id']) ? intval($_GET['id']) : 0;
if ($id < 1)
    message($lang_common['Bad request']);

// Load the viewforum.php language file
require PUN_ROOT.'lang/'.$pun_user['language'].'/forum.php';

// Fetch some info about the forum
$result = $db->query('SELECT f.forum_name, f.redirect_url, f.moderators, f.num_topics, f.sort_by, fp.post_topics FROM '.$db->prefix.'forums AS f LEFT JOIN '.$db->prefix.'forum_perms AS fp ON (fp.forum_id=f.id AND fp.group_id='.$pun_user['g_id'].') WHERE (fp.read_forum IS NULL OR fp.read_forum=1) AND f.id='.$id) or error('Unable to fetch forum info', __FILE__, __LINE__, $db->error());
if (!$db->num_rows($result))
    message($lang_common['Bad request']);

$cur_forum = $db->fetch_assoc($result);

// Is this a redirect forum? In that case, redirect!
if ($cur_forum['redirect_url'] != '')
{
    header('Location: '.$cur_forum['redirect_url']);
    exit;
}

// Sort out who the moderators are and if we are currently a moderator (or an admin)
$mods_array = array();
if ($cur_forum['moderators'] != '')
    $mods_array = unserialize($cur_forum['moderators']);

$is_admmod = ($pun_user['g_id'] == PUN_ADMIN || ($pun_user['g_id'] == PUN_MOD && array_key_exists($pun_user['username'], $mods_array))) ? true : false;

// Can we or can we not post new topics?
if (($cur_forum['post_topics'] == '' && $pun_user['g_post_topics'] == '1') || $cur_forum['post_topics'] == '1' || $is_admmod)
    $post_link = "\t\t".'<p class="postlink conr"><a href="post.php?fid='.$id.'">'.$lang_forum['Post topic'].'</a></p>'."\n";
else
    $post_link = '';


// Determine the topic offset (based on $_GET['p'])
$num_pages = ceil($cur_forum['num_topics'] / $pun_user['disp_topics']);

$p = (!isset($_GET['p']) || $_GET['p'] <= 1 || $_GET['p'] > $num_pages) ? 1 : $_GET['p'];
$start_from = $pun_user['disp_topics'] * ($p - 1);

// Generate paging links
$paging_links = $lang_common['Pages'].': '.paginate($num_pages, $p, 'viewforum.php?id='.$id);


$page_title = pun_htmlspecialchars($pun_config['o_board_title'].' / '.$cur_forum['forum_name']);
define('PUN_ALLOW_INDEX', 1);
require PUN_ROOT.'header.php';

?>
<div class="linkst">
    <div class="inbox">
        <p class="pagelink conl"><?php echo $paging_links ?></p>
<?php echo $post_link ?>
        <ul><li><a href="index.php"><?php echo $lang_common['Index'] ?></a> </li><li>» <?php echo pun_htmlspecialchars($cur_forum['forum_name']) ?></li></ul>
        <div class="clearer"></div>
    </div>
</div>

<div id="vf" class="blocktable">
    <h2><span><?php echo pun_htmlspecialchars($cur_forum['forum_name']) ?></span></h2>
    <div class="box">
        <div class="inbox">
            <table cellspacing="0">
            <thead>
                <tr>
                    <th class="tcl" scope="col"><?php echo $lang_common['Topic'] ?></th>
                    <th class="tc2" scope="col"><?php echo $lang_common['Replies'] ?></th>
                    <th class="tc3" scope="col"><?php echo $lang_forum['Views'] ?></th>
                    <th class="tcr" scope="col"><?php echo $lang_common['Last post'] ?></th>
                </tr>
            </thead>
            <tbody>
<?php

// Fetch list of topics to display on this page
if ($pun_user['is_guest'] || $pun_config['o_show_dot'] == '0')
{
    // Without "the dot"
    $sql = 'SELECT id, poster, subject, posted, last_post, last_post_id, last_poster, num_views, num_replies, closed, sticky, moved_to FROM '.$db->prefix.'topics WHERE forum_id='.$id.' ORDER BY sticky DESC, '.(($cur_forum['sort_by'] == '1') ? 'posted' : 'last_post').' DESC LIMIT '.$start_from.', '.$pun_user['disp_topics'];
}
else
{
    // With "the dot"
    switch ($db_type)
    {
        case 'mysql':
        case 'mysqli':
            $sql = 'SELECT p.poster_id AS has_posted, t.id, t.subject, t.poster, t.posted, t.last_post, t.last_post_id, t.last_poster, t.num_views, t.num_replies, t.closed, t.sticky, t.moved_to FROM '.$db->prefix.'topics AS t LEFT JOIN '.$db->prefix.'posts AS p ON t.id=p.topic_id AND p.poster_id='.$pun_user['id'].' WHERE t.forum_id='.$id.' GROUP BY t.id ORDER BY sticky DESC, '.(($cur_forum['sort_by'] == '1') ? 'posted' : 'last_post').' DESC LIMIT '.$start_from.', '.$pun_user['disp_topics'];
            break;

        case 'sqlite':
            $sql = 'SELECT p.poster_id AS has_posted, t.id, t.subject, t.poster, t.posted, t.last_post, t.last_post_id, t.last_poster, t.num_views, t.num_replies, t.closed, t.sticky, t.moved_to FROM '.$db->prefix.'topics AS t LEFT JOIN '.$db->prefix.'posts AS p ON t.id=p.topic_id AND p.poster_id='.$pun_user['id'].' WHERE t.id IN(SELECT id FROM '.$db->prefix.'topics WHERE forum_id='.$id.' ORDER BY sticky DESC, '.(($cur_forum['sort_by'] == '1') ? 'posted' : 'last_post').' DESC LIMIT '.$start_from.', '.$pun_user['disp_topics'].') GROUP BY t.id ORDER BY t.sticky DESC, t.last_post DESC';
            break;

        default:
            $sql = 'SELECT p.poster_id AS has_posted, t.id, t.subject, t.poster, t.posted, t.last_post, t.last_post_id, t.last_poster, t.num_views, t.num_replies, t.closed, t.sticky, t.moved_to FROM '.$db->prefix.'topics AS t LEFT JOIN '.$db->prefix.'posts AS p ON t.id=p.topic_id AND p.poster_id='.$pun_user['id'].' WHERE t.forum_id='.$id.' GROUP BY t.id, t.subject, t.poster, t.posted, t.last_post, t.last_post_id, t.last_poster, t.num_views, t.num_replies, t.closed, t.sticky, t.moved_to, p.poster_id ORDER BY sticky DESC, '.(($cur_forum['sort_by'] == '1') ? 'posted' : 'last_post').' DESC LIMIT '.$start_from.', '.$pun_user['disp_topics'];
            break;

    }
}

$result = $db->query($sql) or error('Unable to fetch topic list', __FILE__, __LINE__, $db->error());

// If there are topics in this forum.
if ($db->num_rows($result))
{
    while ($cur_topic = $db->fetch_assoc($result))
    {
        $icon_text = $lang_common['Normal icon'];
        $item_status = '';
        $icon_type = 'icon';

        if ($cur_topic['moved_to'] == null)
            $last_post = '<a href="viewtopic.php?pid='.$cur_topic['last_post_id'].'#p'.$cur_topic['last_post_id'].'">'.format_time($cur_topic['last_post']).'</a> <span class="byuser">'.$lang_common['by'].' '.pun_htmlspecialchars($cur_topic['last_poster']).'</span>';
        else
            $last_post = ' ';

        if ($pun_config['o_censoring'] == '1')
            $cur_topic['subject'] = censor_words($cur_topic['subject']);

        if ($cur_topic['moved_to'] != 0)
            $subject = $lang_forum['Moved'].': <a href="viewtopic.php?id='.$cur_topic['moved_to'].'">'.pun_htmlspecialchars($cur_topic['subject']).'</a> <span class="byuser">'.$lang_common['by'].' '.pun_htmlspecialchars($cur_topic['poster']).'</span>';
        else if ($cur_topic['closed'] == '0')
            $subject = '<a href="viewtopic.php?id='.$cur_topic['id'].'">'.pun_htmlspecialchars($cur_topic['subject']).'</a> <span class="byuser">'.$lang_common['by'].' '.pun_htmlspecialchars($cur_topic['poster']).'</span>';
        else
        {
            $subject = '<a href="viewtopic.php?id='.$cur_topic['id'].'">'.pun_htmlspecialchars($cur_topic['subject']).'</a> <span class="byuser">'.$lang_common['by'].' '.pun_htmlspecialchars($cur_topic['poster']).'</span>';
            $icon_text = $lang_common['Closed icon'];
            $item_status = 'iclosed';
        }

        if (!$pun_user['is_guest'] && $cur_topic['last_post'] > $pun_user['last_visit'] && $cur_topic['moved_to'] == null)
        {
            $icon_text .= ' '.$lang_common['New icon'];
            $item_status .= ' inew';
            $icon_type = 'icon inew';
            $subject = '<strong>'.$subject.'</strong>';
            $subject_new_posts = '<span class="newtext">[ <a href="viewtopic.php?id='.$cur_topic['id'].'&action=new" title="'.$lang_common['New posts info'].'">'.$lang_common['New posts'].'</a> ]</span>';
        }
        else
            $subject_new_posts = null;

        // Should we display the dot or not? :)
        if (!$pun_user['is_guest'] && $pun_config['o_show_dot'] == '1')
        {
            if ($cur_topic['has_posted'] == $pun_user['id'])
                $subject = '<strong>·</strong> '.$subject;
            else
                $subject = '  '.$subject;
        }

        if ($cur_topic['sticky'] == '1')
        {
            $subject = '<span class="stickytext">'.$lang_forum['Sticky'].': </span>'.$subject;
            $item_status .= ' isticky';
            $icon_text .= ' '.$lang_forum['Sticky'];
        }

        $num_pages_topic = ceil(($cur_topic['num_replies'] + 1) / $pun_user['disp_posts']);

        if ($num_pages_topic > 1)
            $subject_multipage = '[ '.paginate($num_pages_topic, -1, 'viewtopic.php?id='.$cur_topic['id']).' ]';
        else
            $subject_multipage = null;

        // Should we show the "New posts" and/or the multipage links?
        if (!empty($subject_new_posts) || !empty($subject_multipage))
        {
            $subject .= '  '.(!empty($subject_new_posts) ? $subject_new_posts : '');
            $subject .= !empty($subject_multipage) ? ' '.$subject_multipage : '';
        }

?>
                <tr<?php if ($item_status != '') echo ' class="'.trim($item_status).'"'; ?>>
                    <td class="tcl">
                        <div class="intd">
                            <div class="<?php echo $icon_type ?>"><div class="nosize"><?php echo trim($icon_text) ?></div></div>
                            <div class="tclcon">
                                <?php echo $subject."\n" ?>
                            </div>
                        </div>
                    </td>
                    <td class="tc2"><?php echo ($cur_topic['moved_to'] == null) ? $cur_topic['num_replies'] : ' ' ?></td>
                    <td class="tc3"><?php echo ($cur_topic['moved_to'] == null) ? $cur_topic['num_views'] : ' ' ?></td>
                    <td class="tcr"><?php echo $last_post ?></td>
                </tr>
<?php

    }
}
else
{

?>
                <tr>
                    <td class="tcl" colspan="4"><?php echo $lang_forum['Empty forum'] ?></td>
                </tr>
<?php

}

?>
            </tbody>
            </table>
        </div>
    </div>
</div>

<div class="linksb">
    <div class="inbox">
        <p class="pagelink conl"><?php echo $paging_links ?></p>
<?php echo $post_link ?>
        <ul><li><a href="index.php"><?php echo $lang_common['Index'] ?></a> </li><li>» <?php echo pun_htmlspecialchars($cur_forum['forum_name']) ?></li></ul>
        <div class="clearer"></div>
    </div>
</div>
<?php

$forum_id = $id;
$footer_style = 'viewforum';
require PUN_ROOT.'footer.php';