gistfile1.js

    loadNextTrack: function(){
        this.load_next_track_lock = true;
        if (!this.playlist || !this.currentTrack || !this.playlist.iter_next(this.currentTrack)) {
            if (RepeatType.ALL == this.repeat) {
                this.currentTrack = this.playlist.get_iter_first()[1];
            } else { 
                this.currentTrack = null;
            }
        } else {
            this.load( this.playlist.get_value( this.currentTrack, this.playlistField), false);
            this.play();
        }
    },