Bidit.b.listen("ready", function(){
  $$("form.need_subscription_upgrade").each(function(element) {
    element.stopObserving("submit");
    element.observe("submit", function(e) {
      Bidit.Dialogue.show({url:'/subscriptions?subscription_type=' + element.readAttribute('data-bidtype')});
      e.stop();
    });
  });
});