Mounting different instances of a network volume with different permission

Hey,

I'm wondering if there is a way to mount a network volume several times with different user account in order to access different files.

Here is the situation:
My office server (running Tiger, of course) has a lot of users, one for each client, with all their associated web sites.

Until now, when i want to work on one of them, i have to unmount the volume with the previous account to be able to re-authenticate with the new user.
Is there a way around this?

Thanks!

 

Yep, I'm talking about AFP, should have made that clear in the first place.

The process works as you describe for the first mount; subsequent mounts skip step 2, unfortunately.

I can always try to set group permissions to set up different groups for sets of users a la old fashioned UNIX, but I would have to always be maintaining the folders' permissions everywhere, and group access. Wouldn't be optimal.