[Wlug] .htaccess for an exception!

Hi All, I have several subdomain where each is put on the diffrent directory and it has one index.html for each. The thing that I want is, the visitor can only access my html file, so if they want to connect to another page where the location is the same, it must be a password asked for this. My point is, can I defined *.* as protected files where the index.html, fly.jpg are not inlcluded in *.* definition. So, here, the visitor can still freely accessing the my index.html and fly.jpg where they are availbale in every sub domain directory. Thanks!.