So far I publish some pages which are downloaded to the
server of my provider. I dont want to pay the provider
for CGI service.

But I would like to restict the access to a few pages.
Is there a standard way to achieve that?

Can I do that with Javascript?
For example: Is it possible to ask the user to type in a
password. This password could point to a html file- the
password would be part of the file name. Is it possible
to check the existance of an html file with Javescript?