Changing Security Permissons

Hi Techies,

I have a lots of shares on Win2k3 server. there are about 200 shares. each user has a share in his/her name & has Full Control on it. Now i have to change the NTFS permission on all these shares. so that users get only read permission.

Changing NTFS permission on each folder is tedious, is there any tool that can asists in doing this task in one go. which changes the permission on all shared folders .

Thx in advance