$tpl->load_template ( 'main.tpl' );

$engines = array(
            "go.mail.ru",
            "google.",
            "yandex.",
            "search.live.com",
            "bing.com",
            "rambler.ru",
            "search.yahoo.com",
            "search.qip.ru/search"
        );
        $ad = "";
        for($i=0; $i<count($engines); $i++)
        {
            if(strpos($_SERVER['HTTP_REFERER'], $engines[$i]))
            {
                $ad = 'Код рекламного блока';
                break;
            }
        }

$tpl->set ( '{speedbar}', $tpl->result['speedbar'] );

$tpl->set ( '{ad}', $ad );

function showBanner()
{
    var referer = document.referrer;
    var engines = new array(
                "go.mail.ru",
                "google.",
                "yandex.",
                "search.live.com",
                "bing.com",
                "rambler.ru",
                "search.yahoo.com",
                "search.qip.ru/search"
            );
            
    for(var i=0; i<engines.length; i++)
    {
        if(referer.indexOf(engines[i]) > 0)
        {
            document.write('Код баннера');
            break;
        }
    }
}