Raiders gamble on youthful coach> SAN DIEGO -- The Oakland Raiders have filled their vacant head coaching position with Philadelphia Eagles offensive coordinator Jon Gruden, Fox-TV reported Wednesday.Gruden will be the third coach in three years for Oakland, which fired Joe Bugel earlier this month after going 4-12, its worst record since 1962.After cutting Bugel, the Raiders' main focus had been on Gruden, New York Jets defensive coordinator and former Cleveland Browns head coach Bill Belichick, and ex-Raiders head coach Art Shell.Fox reported that Gruden and the Raiders reached the agreement after Tuesday's interview, their second meeting this year.The 34-year-old Gruden, who started his NFL coaching career as an offensive assistant with the San Francisco 49ers in 1990, spent three seasons with the Green Bay Packers under Mike Holmgren before becoming the youngest offensive coordinator in NFL history in 1995.Under Gruden's tenure, the Eagles were fifth best in total offense despite three inconsistent quarterbacks. (H.I.)