Lakeside Fire Rescue responds to an early morning structure fire west of Milton.  The Rock County Emergency Dispatch Center reports fire fighters were called to the 9900 block of North Newville Road about 3:30 a.m. Tuesday.  Firefighters battled a blaze in a garage type structure at the residence.  Lakeside fire officials say the detached building was being used as a shed housing a workshop.  No one was reported hurt.