It's against the law -- or is it?A soft toss away from the high-legged kick of the Juan Marichal monument outside AT&T Park, an attention-grabbing sign blows in the gentle breeze. In large, alarming letters, the sign warns of the dangers of purchasing scalped tickets -- and notes that both the buyer and seller can be arrested for doing so. And yet, according to the police code cited on the sign (Good Ol' No. 869) scalping is not strictly illegal: This is a code that prohibits folks from sell