text: // app.mainNavBackground
  
  var Backbone = require ('backbone');
  var $ = require ('jquery');
  
  module.exports = Backbone.View.extend({
    el: '#page',
  
    lockBackground: function(backgroundScroll) {
  
      var bgStyle = '';
      bgStyle += 'position: fixed;';
      bgStyle += 'top: -' + backgroundScroll + 'px;';
  
      this.$el.attr('style', bgStyle);
  
    },
  
    unlockBackground: function() {
      this.$el.removeAttr('style');
    }
  
  });
  