Could some one let me know if this is possible and, if so, how it can be done?

I have 5 assistant webmaster helping me run one of my websites. They each have a different section of the site to run and take care of on their own. I don't want to give out passwords to them for the entire site. Is it possible for me to create a password for a particular directory that only they can access? For example, one is running out of the "Info" directory. Can I password protect that so that the webmaster can upload only to that directory?

Along the same lines, is it possible to do the same with a CGI bin (i.e. split it up so that each of the 5 webmasters only has access to their specific scripts)?

I have a third party hosting the site, I am not hosting it myself.

Thanks in advance.
-matt