router.js

var Router = Backbone.Router.extend({
  routes: {
    ""        :     "main",
    "about"   :     "about"
  },
 
  main: function() {
    Session.set('page', 'main');
    this.navigate('');
  },
 
  about: function(){
    Session.set('page', 'about');
    this.navigate('/about');
  }
 
});
 
var app = new Router;
 
Meteor.startup(function () {
  Backbone.history.start({pushState: true});
});