Direct Users to Sub Directories depending on Credentials

[Harry]

Hi,

I seem to be having trouble implementing somethings which should be
simple!

I can create normal log in scripts fine using forms authentication no
problem.
I want to take it a step further now. I would like a generic log-on
page, but then depending on a field in the database, they would be
directed to one sub-directory on the server but not be able to access
any others.

ie: Three fields in DB. Username, Password, Company.

Username: joebloggs Password: xxxxxxx Company: StillImages
When logging on this user gets redirected to /stillimages/default.aspx

Username: johnsmith Password: xxxxxxx Company: GoodOnes
When logging on this user gets redirected to /goodones/default.aspx


I am just after a bit of advice on what sort of method other people
have used to implement the above type of thing. The end aim is to only
have one log-on box on my home page, so customers can log on and get
directed to their private part of the site.

All thoughts welcome.

Thanks
H