Coming off their bye week, the Giants went home, donned their alternate uniforms, and played  the Dallas Cowboys.  In the first quarter, New York trailed early as Cowboys QB Tony Romo completed a 15-yard TD pass to TE Tony Curtis.  The Giants responded as QB Eli Manning completed an 8-yard TD pass to TE Jeremy Shockey.  In the second quarter, Dallas regained the lead as kicker Nick Folk made a 44-yard field goal. The G-Men took the lead with RB Reuben Droughns getting a 1-yard TD run.  Afterwards, the Cowboys retook the lead with Romo completing a 20-yard TD pass to WR Patrick Crayton.  Originally, the Giants were willing to be down by 3 at halftime.  However, because of a taunting penalty on Dallas LB Kevin Burnett placed them near midfield, New York went for some points.  The Giants would tie the game with kicker Lawrence Tynes getting a 40-yard field goal. In the third quarter, Romo completed a 25-yard TD pass to WR Terrell Owens and the Cowboys regained the lead.  In the fourth quarter, the Giants made a 26-yard field goal from Tynes.  Afterwards, Dallas' Romo and Owens hooked up with each other again on a 50-yard TD pass. During the season series against the Cowboys, the Giants pass defense allowed 8 passing touchdowns, despite only allowing 8 passing touchdowns from their previous opponents this year.
Question: How many passing yards off of touchdowns did Tony Romo have in the first half?
Answer: 35