NTFS Permissions

On a windows 2003 server, I have a shared folder for one of my departments. There are about 30 subfolders in this shared folder. I have a user from another department that needs access to two of the subfolders. I want to map a drive to the shared folder and have the user only see the 2 subfolders and not all 30 subfolders. How can I accomplish this. Thanks.