Навигация в модуле Музыкальная страничка

<?php
if (!defined('DATALIFEENGINE')) {
    header("HTTP/1.0 403 Forbidden");
    exit('Access denied');
}
$cat = (int) $_REQUEST['cat'];
$cat = $cat ? $cat : 1;
$queryMusic = $db->query("SELECT id,name,category,onserver,author,date FROM " . PREFIX . "_music ORDER BY date DESC"); /* LIMIT 50 */
while ($rowMusic = $db->get_row($queryMusic)) {
    $tpl->load_template('music/musicmain.tpl');
    $title = stripslashes($rowMusic['name']);
    $tpl->set('{title}', $title);
    $description = stripslashes($rowMusic['onserver']);
    $tpl->set('{description}', $description);
    if (date(Ymd, $rowMusic['date']) == date(Ymd, $_TIME)) {
        $tpl->set('{date}', $lang['time_heute'] . langdate(", H:i", $rowMusic['date']));
    }
    elseif (date(Ymd, $rowMusic['date']) == date(Ymd, ($_TIME - 86400))) {
        $tpl->set('{date}', $lang['time_gestern'] . langdate(", H:i", $rowMusic['date']));
    }
    else {
        $tpl->set('{date}', langdate($config['timestamp_comment'], $rowMusic['date']));
    }
    if ($config['allow_alt_url'] == "yes") {
        $go_page = $config['http_home_url'] . "user/" . urlencode($rowMusic['author']) . "/";
    }
    else {
        $go_page = "$PHP_SELF?subaction=userinfo&amp;user=" . urlencode($rowMusic['author']);
    }
    $username = stripslashes($rowMusic['author']);
    $tpl->set('{username}', "<a onclick="showUserHint('" . urlencode($username) . "', this); return false;" href="" . $go_page . "">" . $username . "</a>");
    $tpl->set('{id}', $rowMusic['id']);
    $Category = $rowMusic['category'];
    $Category = $db->super_query("SELECT * FROM " . PREFIX . "_music_category WHERE id=$Category");
    $tpl->set('{category}', $Category['name']);
    $tpl->set('{catid}', $Category['id']);
    $tpl->set('{download}', $rowMusic['onserver']);
    $tpl->compile('shablons');
}
$tpl->load_template('music/gmusicmain.tpl');
if ($config['allow_alt_url'] == "yes") {
    $go_page = "" . $config['http_home_url'] . "music/add"";
}
else {
    $go_page = "" . $config['http_home_url'] . "index.php?do=music&op=add"";
}
$tpl->set('{title}', "Музыка");
$tpl->set('{content}', $tpl->result['shablons']);
$tpl->set('{link}', $go_page);
$tpl->compile('MainMusic');
?>

//####################################################################################################################
//         Навигация
//####################################################################################################################
if( $count_all ) {
    $tpl->load_template( 'navigation.tpl' );
    $no_prev = false;
    $no_next = false;
    if( isset( $cstart ) and $cstart != "" and $cstart > 0 ) {
        $prev = $cstart / $perpage;
        if( $config['allow_alt_url'] == "yes" ) {
            if ($prev == 1)
                $prev_page = $url_page . "/";
            else
                $prev_page = $url_page . "/page/" . $prev . "/";
            $tpl->set_block( "'[prev-link](.*?)[/prev-link]'si", "<a href="" . $prev_page . "">\1</a>" );
        }
        else {
            if ($prev == 1)
                $prev_page = $PHP_SELF . "?" . $user_query;
            else
                $prev_page = $PHP_SELF . "?cstart=" . $prev . "&amp;" . $user_query;
            $tpl->set_block( "'[prev-link](.*?)[/prev-link]'si", "<a href="" . $prev_page . "">\1</a>" );
        }
    }
    else {
        $tpl->set_block( "'[prev-link](.*?)[/prev-link]'si", "<span>\1</span>" );
        $no_prev = TRUE;
    }
    if( $perpage ) {
        $pages = "";
        if( $count_all > $perpage ) {
            $enpages_count = @ceil( $count_all / $perpage );
            $cstart = ($cstart / $perpage) + 1;
            if( $enpages_count <= 10 ) {
                for($j = 1; $j <= $enpages_count; $j ++) {
                    if( $j != $cstart ) {
                        if( $config['allow_alt_url'] == "yes" ) {
                            if ($j == 1)
                                $pages .= "<a href="" . $url_page . "/">$j</a> ";
                            else
                                $pages .= "<a href="" . $url_page . "/page/" . $j . "/">$j</a> ";
                        }
                        else {
                            if ($j == 1)
                                $pages .= "<a href="$PHP_SELF?{$user_query}">$j</a> ";
                            else
                                $pages .= "<a href="$PHP_SELF?cstart=$j&amp;$user_query">$j</a> ";
                        }
                    }
                    else
                        $pages .= "<span>$j</span> ";
                }
            }
            else {
                $start = 1;
                $end = 10;
                $nav_prefix = "<span class="nav_ext">{$lang['nav_trennen']}</span> ";
                if( $cstart > 0 ) {
                    if( $cstart > 6 ) {
                        $start = $cstart - 4;
                        $end = $start + 8;
                        if( $end >= $enpages_count ) {
                            $start = $enpages_count - 9;
                            $end = $enpages_count - 1;
                            $nav_prefix = "";
                        }
                        else
                            $nav_prefix = "<span class="nav_ext">{$lang['nav_trennen']}</span> ";
                    }
                }
                if( $start >= 2 ) {
                    if( $config['allow_alt_url'] == "yes" ) $pages .= "<a href="" . $url_page . "/">1</a> <span class="nav_ext">{$lang['nav_trennen']}</span> ";
                    else $pages .= "<a href="$PHP_SELF?{$user_query}">1</a> <span class="nav_ext">{$lang['nav_trennen']}</span> ";
                }
                for($j = $start; $j <= $end; $j ++) {
                    if( $j != $cstart ) {
                        if( $config['allow_alt_url'] == "yes" ) {
                            if ($j == 1)
                                $pages .= "<a href="" . $url_page . "/">$j</a> ";
                            else
                                $pages .= "<a href="" . $url_page . "/page/" . $j . "/">$j</a> ";
                        }
                        else {
                            if ($j == 1)
                                $pages .= "<a href="$PHP_SELF?{$user_query}">$j</a> ";
                            else
                                $pages .= "<a href="$PHP_SELF?cstart=$j&amp;$user_query">$j</a> ";
                        }
                    }
                    else $pages .= "<span>$j</span> ";
                }
                if( $cstart != $enpages_count ) {
                    
                    if( $config['allow_alt_url'] == "yes" ) $pages .= $nav_prefix . "<a href="" . $url_page . "/page/{$enpages_count}/">{$enpages_count}</a>";
                    else $pages .= $nav_prefix . "<a href="$PHP_SELF?cstart={$enpages_count}&amp;$user_query">{$enpages_count}</a>";
                }
                else $pages .= "<span>{$enpages_count}</span> ";
            }
        }
        $tpl->set( '{pages}', $pages );
    }
    if( $perpage and $perpage < $count_all and $i < $count_all ) {
        $next_page = $i / $perpage + 1;
        
        if( $config['allow_alt_url'] == "yes" ) {
            $next = $url_page . '/page/' . $next_page . '/';
            $tpl->set_block( "'[next-link](.*?)[/next-link]'si", "<a href="" . $next . "">\1</a>" );
        } else {
            $next = $PHP_SELF . "?cstart=" . $next_page . "&amp;" . $user_query;
            $tpl->set_block( "'[next-link](.*?)[/next-link]'si", "<a href="" . $next . "">\1</a>" );
        };
    }
    else {
        $tpl->set_block( "'[next-link](.*?)[/next-link]'si", "<span>\1</span>" );
        $no_next = TRUE;
    }
    if( ! $no_prev or ! $no_next ) {
        $tpl->compile( 'navi' );
        switch ( $config['news_navigation'] ) {
            case "2" :
                $tpl->result['content'] = $tpl->result['navi'].$tpl->result['content'];
                break;

            case "3" :
                $tpl->result['content'] = $tpl->result['navi'].$tpl->result['content'].$tpl->result['navi'];
                break;

            default :
                $tpl->result['content'] .= $tpl->result['navi'];
                break;
        }
    }
    $tpl->clear();
}