File field permissions?

["Hylton Conacher(ZR1HPC)" <hylton () conacher co za>]

I need to find out about how to accomplish different permissions on 
similar fields in a database. I'll explain below:

I am investigating whether it would be possible to setup a database 
located at a HEAD Office location. The entry and viewing of each of its 
data records is done from a web interface via web forms.

A running club gives each of its members a unique member number and 
password. some of those members are not normal 'users' but actually look 
after a few specific members.

Details                         Member number
Runner A                        12345
Runner B                        67890
Manager of both A and B         15937

Runner A and B access the database and enter their specific exercise 
session details onto the fields they are allowed to edit ie 1,2 of a 3 
field webform. Each runner will be able to view field 3 but not edit it.

Manager logs in later to check what 'his' members have been doing. The 
manager will be able to view field 1,2 but not edit them. He can only 
edit field 3 of the 3 field form.

Would the above be possible and if so roughly how? I would think that 
the member number would dictate what fields can be edited, but I do not 
know how to accomplish this.

Tnx for the help
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