Intranet WebSite with Windows Authentification and Forms Authentification
Ok, so my background to the problem that i am facing is:

I was given a project to built an intranet website for my company in C# and ASP.NET. At first the specifications were that the site would have a normal login based page with forms (so Forms Authentification). After the project was done, about 90%, the specifications changed. Now the website must have windows mode and forms mode authentification, meaning that, if a users that is accesing the site is on a computer that belongs to a certain Domain it will be automatically logged in, if he isn't in that domain then he must logg in with username and password from database. After hat, i must know in what Group(table in the database) the user is to let him see or not some pages, so i must get the user -username and find the id in the database and so on (this is a different story).

So, this is world crashing for me, for the last two days i was surfing the internet to find out methods, but I have not found anything concrete. I found a method submited by Paul http://aspalliance.com/553_Mixed_Mode_Authentication, but this is for .Net 1... and some comments told that it wouldn't work for later editions. Other thing i found that could help me is Active Directory but did not understand much, and so one. 

If you can give me some steps to follow, articles, links, maybe the Holly Code. thanks in advance
Intranet WebSite with Windows Authentification and Forms Authentification
===

Ok, so my background to the problem that i am facing is:

I was given a project to built an intranet website for my company in C# and ASP.NET. At first the specifications were that the site would have a normal login based page with forms (so Forms Authentification). After the project was done, about 90%, the specifications changed. Now the website must have windows mode and forms mode authentification, meaning that, if a users that is accesing the site is on a computer that belongs to a certain Domain it will be automatically logged in, if he isn't in that domain then he must logg in with username and password from database. After hat, i must know in what Group(table in the database) the user is to let him see or not some pages, so i must get the user -username and find the id in the database and so on (this is a different story).

So, this is world crashing for me, for the last two days i was surfing the internet to find out methods, but I have not found anything concrete. I found a method submited by Paul http://aspalliance.com/553_Mixed_Mode_Authentication, but this is for .Net 1... and some comments told that it wouldn't work for later editions. Other thing i found that could help me is Active Directory but did not understand much, and so one. 

If you can give me some steps to follow, articles, links, maybe the Holly Code. thanks in advance