DON McDERMOTT / PVT The Nevada State Track and Field championships will be contested today and Saturday at Del Sol High School in east Las Vegas. Here are some scenes from the Southern regionals last weekend. At right, Pahrump Valley hurdlers Melissa Ewing and Stevie McElheny compete in the 100-meter hurdles. Below left, Anthony Turner was one of the principal scorers for the Beatty boys. At the lower right, Nick Stearns, right, of Pahrump Valley attempts to qualify in the 110-meter high hurdles.