Section I-Basket/Backboard
a. A team's basket consists of the basket ring and net through which its players try to shoot the ball. The visiting team has the choice of baskets for the first half. The basket selected by the visiting team when it first enters onto the court shall be its basket for the first half.
b. The teams change baskets for the second half. All overtime periods are considered extensions of the second half.
http://www.nba.com/analysis/rules_4....av=ArticleList