I have a VisualSVN Server installed on a Windows server, serving several repositories.

Since the web-viewer built into VisualSVN server is a minimalistic subversion browser, I'd like to install WebSVN on top of my repositories.

The problem, however, is that I can't seem to get authentication to work. Ideally I'd like my current repository authentication as specified in VisualSVN to work with WebSVN, so that though I see all the repository names in WebSVN, I can't actually browse into them without the right credentials.

By visiting the cached copy of the topmost link on this google query you can see what I've found so far that looks promising.
(the main blog page seems to have been destroyed, domain of the topmost page I'm referring to is the-wizzard.de)

There I found some php functions I could tack onto one of the php files in WebSVN. I followed the modifications there, but all I succeeded in doing was make WebSVN ask me for a username and password and no matter what I input, it won't let me in.

Unfortunately, php and apache is largely black magic to me.

So, has anyone successfully integrated WebSVN with VisualSVN hosted repositories?