gistfile1.js

var FluffyRouter = Backbone.Router.extend({
	routes: {
		'seal panda bunny': 'update',
		'*default': 'update'
	},
	update: function(){
		var id = Backbone.history.fragment || 'bunny';
		$('.view').hide();
		$('#' + id).show();
		this.navigate(id);
	}
});

var NavView = Backbone.View.extend({
	el: '#nav',

	initialize: function(options){
		this.listenTo(options.router, 'route', this.render);
		this.render();
	},

	render: function(){
		this.$('a').removeClass('active');
		this.$('a[href="#' + Backbone.history.fragment + '"]').addClass('active');
	}
});
var router = new FluffyRouter();
var nav = new NavView({router: router});
Backbone.history.start();