BILL O'REILLY, who became rich and successful by behaving like an adolescent on television, has now written an advice book for adolescents on how to become rich and successful.As if that weren't enough to make any playground bully's head spin -- should he renounce his tactics or perfect them? -- ''The O'Reilly Factor for Kids'' raises a more difficult question: which Bill O'Reilly should the youth of America aspire to emulate, Bill O'Reilly the anchor or Bill O'Reilly the author? Appearances to the contrary, they are not quite the same. Although both Bills like to make fun of ''pinheads,'' on...