validating the form process from the mini-portal

//
// Generate the whos online block
//
function generate_whosonline()
{
    global $pun_config, $lang_common, $pun_user, $db;
    
    if ($pun_user['is_guest'])
    {
        require PUN_ROOT.'lang/'.$pun_user['language'].'/login.php';
        return 'Welcome Guest!<br />
            Please login.<br />
            <form id="login" method="post" action="login.php?action=in" onsubmit="return process_form(this)"><div>
                <input type="hidden" name="form_sent" value="1" />
                <input type="hidden" name="redirect_url" value="index.php" />
                <label><strong>Username</strong><br /><input type="text" name="req_username" size="13" maxlength="25" tabindex="1" /><br /></label>
                <label><strong>Password</strong><br /><input type="password" name="req_password" size="13" maxlength="16" tabindex="2" /><br /></label>
                <p><a href="register.php" tabindex="4">'.$lang_login['Not registered'].'</a><br />
                <a href="login.php?action=forget" tabindex="5">'.$lang_login['Forgotten pass'].'</a></p>
                <p><input type="submit" name="login" value="Login" tabindex="3" /></p>
            </div></form>';
    }
    else
    {
        require PUN_ROOT.'lang/'.$pun_user['language'].'/index.php';
        $result = $db->query('SELECT COUNT(id)-1 FROM '.$db->prefix.'users') or error('Unable to fetch total user count', __FILE__, __LINE__, $db->error());
        $stats['total_users'] = $db->result($result);
        
        $result = $db->query('SELECT id, username FROM '.$db->prefix.'users ORDER BY registered DESC LIMIT 1') or error('Unable to fetch newest registered user', __FILE__, __LINE__, $db->error());
        $stats['last_user'] = $db->fetch_assoc($result);
        
        $result = $db->query('SELECT SUM(num_topics), SUM(num_posts) FROM '.$db->prefix.'forums') or error('Unable to fetch topic/post count', __FILE__, __LINE__, $db->error());
        list($stats['total_topics'], $stats['total_posts']) = $db->fetch_row($result);
        
        if ($pun_config['o_users_online'] == '1')
        {
            // Fetch users online info and generate strings for output
            $num_guests = 0;
            $users = array();
            $online = array();
            $result = $db->query('SELECT user_id, ident FROM '.$db->prefix.'online WHERE idle=0 ORDER BY ident', true) or error('Unable to fetch online list', __FILE__, __LINE__, $db->error());
        
            while ($pun_user_online = $db->fetch_assoc($result))
            {
                if ($pun_user_online['user_id'] > 1)
                    $users[] = "\n\t\t\t\t".'<a href="profile.php?id='.$pun_user_online['user_id'].'">'.pun_htmlspecialchars($pun_user_online['ident']).'</a><br />';
                else
                    ++$num_guests;
            }
        
            $num_users = count($users);
            $online[] = "\t\t\t\t".$lang_index['Users online'].': <strong>'.$num_users.'</strong><br />'."\n\t\t\t\t".$lang_index['Guests online'].': <strong>'.$num_guests.'</strong>'."\n\t\t\t"."\n";
        
        
            if ($num_users > 0 && $num_users < 10)
                $online[] = "\t\t\t"."\n\t\t\t\t".'<br /><strong>'.$lang_index['Online'].': </strong>'."\t\t\t\t".implode($users)."\n";
            else
                $online[] = "\t\t\t".'<div class="clearer"></div>'."\n";
        
        }
        
        return 'Welcome <strong>'.$pun_user['username'].'</strong><br /><br />
            '.implode($online,'').'<br />
            Users: <strong>'. $stats['total_users'].'</strong><br />
            Topics: <strong>'.$stats['total_topics'].'</strong><br />
            Posts: <strong>'.$stats['total_posts'].'</strong><br />';
    }
}