Authentication for anonymous users?

[SuslovN]

What should I do for realising the following task:
Anonymous users can browse my ASP.net site( limited number of pages), but
when the try to access restricted area (only for authorized users) they
redirected to Login.aspx page (acording to configuration in web.config
authentication section).
I want to use "forms authentication" and "sql db" whith users credentials.
How can I manage anonymous users permitions "allowing veiwing and deny
viewing" pages in ASP.net site not using web.config authorisation section ?

Thanks.
SuslovN.