The web server software is Apache HTTP Server and you can stick a text file named .htaccess in a directory that affects that directory and its subdirectories.
You can modify the server-generated directory indexes to cause a "403 Forbidden" error response instead using the directive:
And if for some reason you want intercept these errors you can do so using the following directive:
ErrorDocument 403 forbidden-response
Where forbidden-response could be a URL. If the URL is to a local script or a server-parsed document, you can detect if the request is for a directory.
openvein.org -//- One-time [color=#6600CC]$50.00 discount[/color] on [color=#0000CC]DreamHost[/color] plans: Use ATROPOS7