websv authentication help

Hi

I've configured websvn to browse my repos, but now I want to configure
access rights and authentication to it. In the documentation it mentions
that I need to uncomment one line in the config.php (which I have done)
and it also mentions about configuring the /websvn directory. It talks
about SSPI and it even gives a sample of the configuration but it does
not mention where to place that.

Any one here has configured websvn (http://websvn.tigris.org/) with
authentication that can point me in the right direction? I have
subversion working on a CentOS 5.1 box.

Thanks!

--
Dan