On the markets at midafternoon (ET):In Toronto, the S&P/TSX composite index is down 15.91 points to 15,128.08.The Dow Jones industrial average gained 19.33 points to 21,551.47.The Standard & Poor’s 500 index added 3.73 points to 2,446.98.The Nasdaq composite index climbed 4.48 points to 6,265.66.The Canadian dollar was trading at 78.52 cents US, up from Wednesday’s average price of 78.16 cents US.