> So I realize that I should be using form
> authentication. However, each and every time I try
> this it takes me to different login page....any idea
> what's going on?
You have to have httrack log in:
<http://httrack.kauler.com/help/Authentication>
And don't forget to filter out the log-out url

Also robots.txt says:
Disallow: /membership/
So you'll have to override robots.