2 apache q's: Sunbird and password protection

[Fractalice]

I have 2 hopefully quick apache questions. Let me preface this by saying that I am not in charge of the server in question, but the person who is doesn't know jack and won't go out of their way to find out, so it's up to me to get the info and figure out the solutions for them to implement.

Alright, with that out of the way, here is question 1:
I need to password protect a folder called Admin. The server was set up previously to use this, but then we had to reset all the permissions due to an error, and now the directory is open. How can I go about this? Our server is an OS X server running apache, and we have users set up through the workgroup manager in the

http://www group

that should have access to this folder. Currently,

http://www is

the owner of the folder.

Question 2: We are going to be deploying Mozilla Sunbird to multiple users to update ics calendar files on the web. Before the aforementioned permission reset, publishing the calendar gave you a user name/password box asking for the password to the iCal group. Now, it asks for the password to the

http://www group,

but I need to switch it back it iCal. Is this a folder owner problem, or something else? I would like to keep these users separate from www, so they can't access files on the server.

Thanks a bunch in advance