gistfile1.js

var Threshold = {
  Models: {},
  Collections: {},
  Views: {},
  Routers: {},
  init: function() {
    if (window.url == "blah") {
      projectShowInit();
    } else {
      projectsInit();
    }
    Backbone.history.start();
  }
};

var projectShowInit = function() {
  window.ProjectView = new Threshold.Routers.ProjectShow();
}

var projectsInit = function() {
  window.ProjectDashboard = new Threshold.Routers.ProjectDashboard();
}