Access Denied Landing and logout landing

Currently I have a few pages and a Document library I have only given view access to one role called "Clients". This seems to work great however if someone isn't logged in a tries to view the page or document it take s the user to an asp.Net error screen. How do I create a custom Warning screen telling the user they don't have rights to do that, please login or click here to request access.

Also, Can I login/logout standard control to pop up a login screen? rather than take them the SF branded backend login screen?