Sending NT domain user and password for a folder from an ASP form

[torga]

I want to restrict access to my site by the typical session protected mode, but there is one problem: There is no restriction for the images. My intention is that the users could put their own userID and password for the session protection only one time, so i could stablish a unique user and password for all the users sended by the ASP code.
Thank you very much for all!