San Diego Chargers wide receiver Vincent Jackson (83) reaches up to make a reception in front of Dallas Cowboys cornerback Orlando Scandrick (32) in the first half of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) warms up before the start of a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

San Diego Chargers quarterback Philip Rivers drops back to pass in the first half of a preseason NFL football game against the Dallas Cowboys Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tony Gutierrez)

San Diego Chargers head coach Norv Turner and Dallas Cowboys head coach Jason Garrett visit before the start of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tony Gutierrez)

San Diego Chargers running back Ryan Mathews (24) looks for an opening against Dallas Cowboys defensive end Kenyon Coleman (98) in the first half of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys tight end Jason Witten (82) fights for extra yardage after making a reception as San Diego Chargers linebacker Takeo Spikes (51) attempts to bring him down in the first half of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tim Sharp)

Dallas Cowboys quarterback Tony Romo (9) stays in the pocket as he passes in the first half of a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) and running back Felix Jones (28) get tangled up on a hand off in the first half of a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

San Diego Chargers tight end Randy McMichael comes down with a touchdown reception in the first half of a preseason NFL football game against the Dallas Cowboys Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys running back Felix Jones (28) looks for open room after taking a hand off as San Diego Chargers linebacker Larry English (52) gives chase in the first half of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

San Diego Chargers running back Ryan Mathews (24) fights off Dallas Cowboys linebacker DeMarcus Ware, right, on a run in the first half of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tim Sharp)

Dallas Cowboys running back Lonyae Miller (35) fights for extra yardage as San Diego Chargers linebacker Stephen Cooper, center, and Shareece Wright, attempt to bring him down in the second half of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

San Diego Chargers quarterback Billy Volek (7) throws a pass to tight end Randy McMichael, left, in the first half of a preseason NFL football game against the Dallas Cowboys Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

San Diego Chargers head coach Norv Turner reacts to an short and goal play in the first half of a preseason NFL football game against the Dallas Cowboys Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tim Sharp)

Dallas Cowboys quarterback Jon Kitna (3) looks to pass in the first half of a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tim Sharp)

Dallas Cowboys head coach Jason Garrett, left, talks with line judge Byron Boston (18) and a fellow official, rear, in the first half of a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

San Diego Chargers tight end Randy McMichael (81) fights off Dallas Cowboys cornerback Alan Ball (20) after making a reception in the first half of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

San Diego Chargers fullback Jacob Hester (22) reaches out to make a reception in the first half of a preseason NFL football game against the Dallas Cowboys Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

Back judge back judge Billy Smith (2) signals touchdown on a Dallas Cowboys' Jason Witten reception in the first half of a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tim Sharp)

San Diego Chargers safety Steve Gregory (28) defends as Dallas Cowboys tight end Jason Witten (82) comes down with a touchdown reception in the first half of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

San Diego Chargers head coach Norv Turner shouts at head linesman Steve Stelljes (22) during a preseason NFL football game against the Dallas Cowboys Sunday, Aug. 21, 2011, in Arlington, Texas. The Chargers won 20-7. (AP Photo/LM Otero)

San Diego Chargers quarterback Philip Rivers (17) and Dallas Cowboys quarterback Tony Romo (9) talk on the field following their preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. The Chargers won 20-7. (AP Photo/LM Otero)

Dallas Cowboys running back Phillip Tanner (34) heads for the endzone after losing his helmet on an attempted tackle in the second half of a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. Officials ruled that the ball was dead once Tanner lost his helmet and therefore the touchdown was nullified. The Chargers won 20-7. (AP Photo/LM Otero)

Dallas Cowboys running back Phillip Tanner runs the ball during a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. San Diego won the game 20-7. (AP Photo/LM Otero)

Dallas Cowboys cheerleader during a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tim Sharp)

Dallas Cowboys defensive coordinator Rob Ryan shouts instructions during a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. San Diego won the game 20-7. (AP Photo/LM Otero)

Rowdy the Dallas Cowboys' mascot interacts with fans during a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. San Diego won the game 20-7. AP Photo/LM Otero)

Dallas Cowboys running back Lonyae Miller (35) during a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

San Diego Chargers running back Ryan Mathews (24) during a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tim Sharp)

An interior view of Cowboys stadium during the second half of a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tim Sharp)

Dallas Cowboys head coach Jason Garrett during a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. The Chargers won 20-7. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) scrambles against the San Diego Chargers during a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. San Diego won the game 20-7. (AP Photo/Tim Sharp)

San Diego Chargers quarterback Philip Rivers (17) drops back to pass in the first half of a preseason NFL football game against the Dallas Cowboys Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys running back Felix Jones (28) during the first half of a preseason NFL football game against the San Diego Chargers Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/Tim Sharp)

Dallas Cowboys cornerback Orlando Scandrick (32) grabs San Diego Chargers wide receiver Vincent Jackson (83) during the first half of a preseason NFL football game Sunday, Aug. 21, 2011, in Arlington, Texas. (AP Photo/LM Otero)