Well, you at least have to make the folder "readable" and able to execute scripts, but normally not writable. If all you have in there are php scripts and images, then you really dont have a problem with those permissions, but I advise you to ask your system administrator before you do anything since I have no idea how your system is setup, but if you want to execute scripts, you have to make the folder that permission, but consult a system admin or some kind of admin before you do it.