An AppleScript to modify user permissions

I’m looking for an easy way of changing permissions on users folders. Files are constantly being swapped around between users, and I want to access others files while logged in as the administrator’s account, and vice versa.

Thanks

Model: MacBook Pro, 10.6.3, 2.53GHz Intel Core 2 Duo, 4GB DDR3
AppleScript: 2.1.2
Browser: Safari 6531.22.7
Operating System: Mac OS X (10.6)