COLOR PHOTOPhotograph by John Biever Cowboy Up!   Dallas wide receiver Keyshawn Johnson didn't come down with the ball, but he probably came down with an aching back after this hit by Minnesota cornerback Brian Williams during the Vikings' 35-17 win in Minneapolis on Sunday (page 52). COLOR PHOTOPhotograph by John Biever Holiday Greetings   Michigan cornerback Markus Curry breaks up a pass intended for Notre Dame receiver Carlyle Holiday (7) during a 28-20 victory by the Irish in South Bend last Saturday (page 88). COLOR PHOTOPhotograph by Al Tielemans Flight Pattern   Steelers defensive back Mike Logan is right on course as he launches himself at Oakland running back J.R. Redmond during their season-opener in Pittsburgh on Sunday, which the Steelers won 24-21 (page 54).