Help! Login fails when run inside a frame!

[Guest]

I have an ASP 2.0 secured website that works fine.

My problem is that I need to run this "mini site" inside a frame.

We have a domain hosted website and I'm redirecting the frame contents to
our IIS server and my MD doesn't want the customers seeing a "messy" IP
address, so the solution was to run the mini-site inside a frame. However,
despite the login screen being displayed, when a user logs in, the
user.identity.name is null and roles are not set.

Any ideas?