We don't use no Prototype JS.

app/controllers/contacts_controller.rb

@@ -86,6 +86,11 @@ class ContactsController < ApplicationController
   def update
     c = Contact.find(params[:id])
     c.update_attributes(params[:contact])
+
+    # birthdate comes w/ day + month separated from year
+    c.birth_month = params[:birth_month].to_i if c.birth_month != params[:birth_month]
+    c.birth_day = params[:birth_day].to_i if c.birth_day != params[:birth_day]
+
     if c.save!
       flash[:notice] = 'Kontakt aktualisiert.'
       redirect_to :action => :index

config/environments/development.rb

@@ -11,7 +11,7 @@ ContactORama::Application.configure do
 
   # Show full error reports and disable caching
   config.consider_all_requests_local       = true
-  config.action_view.debug_rjs             = true
+  # config.action_view.debug_rjs             = true
   config.action_controller.perform_caching = false
 
   # Don't care if the mailer can't send