Isolating FTP Users in IIS5

I am trying to setup an FTP site with IIS 5 that will only allow students to access their FTP folder only. I have used the Technet article: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechnol/windowsserver2003/proddocs/server/wsa_ftp_isolate.asp. It puts the user to their home directory but allows them to move up a directory to the main ftp site.

I am trying to give each Web Design Student their own Website on IIS and isolate them to FTP only to their site. Any help would be appreciated.