var mp3player_window = "";

function openMP3PlayerPopup()
{
  mp3player_window = window.open('/mp3player/webplayer.html','mywindow','height=100, width=320');
}

function playMP3Item(item_nb)
{
  // adding a file to the popup players playlist
  
  var spawn = false;
  if (!mp3player_window)    spawn=true;
  else if ( mp3player_window.closed) spawn=true;
  
  if ( spawn)
  {
    openMP3PlayerPopup();
    if ( !mp3player_window.playMP3Item)
    {
      var ex = "playMP3Item('"+item_nb+"')";
      setTimeout(ex, 2000);
    }
  }
  else
  {
    mp3player_window.playMP3Item(item_nb);
    mp3player_window.focus();
  }
}