Hoping to rebound from their last-second loss to the Ravens, the Chargers flew back home and donned their throwback uniforms for a Sunday Night match-up with the defending Super Bowl champions, the Pittsburgh Steelers.  The Chargers struggled early as their offense actually had &#8722;2 total yards, while the defense gave up a 9-yard TD run by RB Willie Parker in the first quarter.  In the second quarter, the Chargers continued to trail, as Steelers kicker Jeff Reed completed a 39-yard field goal.  San Diego would start to get back into the game, as QB Philip Rivers completed a 9-yard TD pass to WR Malcom Floyd.  In the third quarter, the Chargers charged right into the lead, as kicker Nate Kaeding kicked a 28-yard field goal, while Rivers hooked up with TE Antonio Gates for a 22-yard TD strike.  In the fourth quarter, Kaeding put the game away with a 33-yard and a 22-yard field goal, while the defense squashed any hope of a Steeler comeback as the Chargers improved to 3-1.. How many more field goals were kicked in the second half than in the first half?