(Albany, OR)  --  The principal of South Albany High School says a fire that ripped through a school building last week was "devastating."  Classes resumed yesterday at the school, where someone set fire to the cafeteria building and caused considerable damage.  School officials told KATU-TV that insurance will cover damage to the building, but not its contents, which included personal items such as musical instruments and costumes.  Police have arrested 28-year-old Zachary Burghart, who's accused of setting fire to the building.