Recent content by Delegat

I am new to access databases and I am in doubt whether the following base is in third normal form Can anyone help me? Image is located at (I do not have enough posts ti preview it here img703.imageshack.us/img703/1097/accessproject.gif

How can I prohibit user from entering non-letters in a text field (one ( I think bad) approach is to define mask as ???????????????????????????????????????... ).