This page demonstrates using Javascript to add a HTML form interface to a HTTP Auth protected URL. A detailed discussion of this technique can be found here and the Javascript file that makes it all work is here.
Note: The log out option is known not to work in Internet Explorer due to the way IE handles remembering incorrect auth credentials.
To test this out, try accessing the protected resource with correct and incorrect credentials, the username "user" and password "password" will let you in.
Log in with Basic Auth