This image made with a fisheye lens shows Invesco Field at Mile High during the first quarter of a preseason NFL football game between the Denver Broncos and the Pittsburgh Steelers Sunday, Aug. 29, 2010, in Denver. (AP Photo/Morry Gash)

This image made with a fisheye lens shows Invesco Field at Mile High during the first quarter of a preseason NFL football game between the Denver Broncos and the Pittsburgh Steelers Sunday, Aug. 29, 2010, in Denver. (AP Photo/Morry Gash)

This image made with a fisheye lens shows Invesco Field at Mile High during the first quarter of a preseason NFL football game between the Denver Broncos and the Pittsburgh Steelers Sunday, Aug. 29, 2010, in Denver. (AP Photo/Morry Gash)

This image made with a fisheye lens shows Invesco Field at Mile High during the first quarter of a preseason NFL football game between the Denver Broncos and the Pittsburgh Steelers Sunday, Aug. 29, 2010, in Denver. (AP Photo/Morry Gash)

This image made with a fisheye lens shows Invesco Field at Mile High during the first quarter of a preseason NFL football game between the Denver Broncos and the Pittsburgh Steelers Sunday, Aug. 29, 2010, in Denver. (AP Photo/Morry Gash)