function set_volume(hodnota,sirka) {
  var vlc = getVLC("vlc");
  vlc.audio.volume = hodnota;
  document.getElementById("volume").style.width = sirka+'px'; 
}

var vlc = getVLC("vlc");
alert(vlc.audio.volume);

function nastav_volume() {
  var max=90;
  var vlc = getVLC("vlc");
  document.getElementById("volume").style.width = (vlc.audio.volume*max/200)+'px'; 
}

function nastav_mute() {
  var vlc = getVLC("vlc");
  if(vlc.audio.volume > 0)
    document.getElementById("volumebcg").style.backgroundPosition = '0px 0px';
  else
    document.getElementById("volumebcg").style.backgroundPosition = '0px -53px';
  nastav_volume();      
}