Help with NTFS write permissions

I run a large school network and have a permission issue that I cannot resolve. First student are setup in different global security groups. On a server 2003 I have created a main directory (which is shared) and subdirectories which are the teachers. The goal is to allow the students to see all the teacher folders but not the content in the folders but they need write permission to the folders. Also, I do not want the students to be able to save or create anything in the main folder. The purpose of the teacher folders is for the students to turn in work for a grade. Help Please