Arlington, Va.—Ad spending on newspaper Web sites jumped 19.3% to $796 million in the second quarter compared with the same period in 2006, according to estimates released Friday by the Newspaper Association of America (NAA). It was the 13th consecutive quarter of double-digit growth since NAA started reporting online ad spending in 2004. Newspaper Web site advertising now accounts for 7% of total newspaper ad spending, up from 5.4% in the second quarter in 2006. Total ad spending on newspapers dropped 8.6% to $11.3 billion in the second quarter. Spending on print ads totaled $10.5 billion, down 10.2% from the year-earlier period. NAA members account for nearly 90% of the daily newspaper circulation in the U.S.