(Excerpt)PHOTOS as it happened: SlideshowMore Photos: SlideshowUPDATED: 8:08 p.m.Chaos erupted this morning at the Richmond International Raceway as thousands of people stampeded through the gates in a rush to buy used iBook laptop computers for $50 each.There were several minor injuries and one person was taken to a hospital with a leg injury, fire Battalion Chief Steve Wood said during a 1 p.m. news conference. In all, 17 people were treated, the majority for heat- or diabetic-related problems, he said.Thousands of Henrico County residents and/or taxpayers stood in a half-mile-long line as dawn broke while others waited in cars parked...