function crawl_1_chapter($url, $chapter)
{
    global $sitename;
    global $prefix;
    // http://ani-haven.net/hr-alpha/Psyren/145/
    // @todo
    $chapter = Crawler::pad($chapter, 3);
    $c = new Crawler($url);
    $c->go_to('id="myselectbox3"');
    $c->readline();
    $pages = Crawler::extract_to_array($c->curline, 'value="', '"');
    $c->close();
    // append $url ke $pages
    foreach ($pages as $i => $page) {
        $pages[$i] = $url . $page;
    }
    Crawler::multiProcess(4, $pages, 'crawl_1_page', array($chapter));
}