The San Francisco 49ers said goodbye to another fixture in their secondary on Friday afternoon as Tarell Brown bolted across the bay for more money.Refusing an offer from the 49ers, cornerback Tarell Brown agreed to a one-year deal worth $3.5 million with the Oakland Raiders. The 49ers wanted Brown back, but they weren't winning to overpay for him.The 49ers are hoping to get a deal done with Seattle free-agent Walter Thurmond, who has the same agent as Brown.