IIS 5 FTP

I need to set up an FTP site for some business clients using IIS 5.0. Here’s the problem, I want to use the same site (1 IP address and port) for all clients using 1 main ftp root folder and have all clients drop into seperate sub-folders based uponlog in, and keep clients from being able to back out of the subfolder into the main ftp root folder. Thus all the clients could “see” is content in their respective folders and would not have rights or ability to move out of their folders into another clients folders and documents.

Thanks in advance