Time has a way of changing things.Just last year, it seemed somewhat abnormal for a Class 3A or lower classification school to play a best-of-three playoff series in baseball. The idea was so new that many coaches still opposed it.But as the 2000 playoffs start this week, not only are Temple and Belton involved in three-game series, Cameron, Salado, and Academy each open the state playoffs with three-game sets in bi-district.Rockdale (14-10) is one team that's sticking to the old one-game format, as it battles Columbus (15-10) in a 3A playoff at 7 p.m. Friday in Bastrop. by Will Wright and Marcus Hood