MECHANICVILLE MAY 12- At 10 AM 2nd Avenue was closed to traffic from Park to Broadway. For the 15th year the Community Preschool children bicycled on 2nd Ave. to raise money for St. Jude's Hospital. School director Bette Ann Thompson reported that the children have raised $30,000 in the previous 14 bicycle rides. St. Jude's Hospital needs $1.8 miooion per day to operate. Thompson said they are very appreciative of the donations from Mechanicville.