multiple databases, multiple css files

[eluser]jared4444[/eluser]
Hi,
I want to basically have one code base but use a different database and css files based on a client.

So:

www.mysite.com/client1 would look like one site and have it's own db, and
www.mysite.com/client2 would look like a totally different site

everything would work off that

the editmenu page would look like this:
www.mysite.com/client1/editmenu/1
or
www.mysite.com/client2/editmenu/1