docs: function(index, state) {
      var self = this;
  
      // Highlight/un-highlight the row.
      window['station' + index].style.backgroundColor = state ? 'rgba(255, 255, 255, 0.33)' : '';
  
      // Show/hide the "live" marker.
      window['live' + index].style.opacity = state ? 1 : 0;
  
      // Show/hide the "playing" animation.
      window['playing' + index].style.display = state ? 'block' : 'none';
    }