Justin Smith emphatically pumped his fist following his game-saving defensive gem. Carlos Rogers danced after his second interception. And their coach, Jim Harbaugh, was perfectly polite in his postgame handshake before pointing and waving to a cheering crowd as he left the field at Candlestick Park. It's been nearly a decade since the San Francisco 49ers could celebrate like this. Smith batted down Eli Manning's pass in the closing seconds of the New York quarterback's latest comeback try, and San Francisco stopped the Giants on fourth down for a 27-20 victory in Sunday's NFC showdown to boost their chances of a possible first-round playoff bye.