function activateVideo(addr, id_div, lang, autoplay) {
  if (typeof lang == "undefined") {
    lang = "cs";
  }
  var flashvars = '';
  var params = {
      menu: "false",
      wmode: "opaque",
      AllowScriptAccess:"always",
      flashvars: flashvars,
      allowFullScreen: true
  };
  var attributes = {
    id: id_div,
    name: id_div,
    allowFullScreen: true
  };
  swfobject.embedSWF('http://www.youtube.com/v/'+addr+'&hl='+lang+'&fs=1&autoplay='+autoplay+'&', id_div, "400", "315", "9.0.0","expressInstall.swf", flashvars, params, attributes);
  return true;
}