function cacheurl($url, $browser_req = true, $cookies = "", $browser = "Firefox")
{
    global $myconfig;
    #find cache file
    $hash = md5($url);
    $datei = "cache/" . $hash;
    if (file_exists($datei)) {
        if (time() - filemtime($datei) < $myconfig['cachetime']) {
            return implode('', file($datei));
        }
    }
    #no cache file exists send browser request
    if ($browser_req == true) {
        $objekt = new Browser($browser);
        if ($cookies != "") {
            $objekt->cookies_set($cookies);
        }
        $objekt->url = $url;
        $t_html = $objekt->read();
    } else {
        $t_html = implode('', file($url));
    }
    d_write($datei, $t_html);
    return $t_html;
}
/**
 * Parse the video url of a given myvideo video link site
 * and returns the http url of the video
 * * 
 * @param string $url
 *   url of video must contain watch/*
 *   http://www.myvideo.de/watch/7125794
 * @return string
 *   the url of the video as http url; should the flv file
 */
function myvideo_flv_download($url)
{
    preg_match('|watch/(\\d+)/|i', $url, $match);
    $objekt = new Browser($browser);
    if ($cookies != "") {
        $objekt->cookies_set($cookies);
    }
    $objekt->url = "http://www.myvideo.de/movie/" . $match[1];
    $objekt->read();
    $head = $objekt->returnHeader();
    preg_match('/V\\=(.*?).flv/', $head['Location'], $matches);
    return urldecode($matches[1]) . ".flv";
}