ClickZ reports that auto retailers increased their advertising by more than half last year, growing automotive adspend to $1.2 billion online in 2004, according to Borrell Associates. Borrell's study predicts that the spending levels will reach $2 billion in 2006, accounting for about one in every 15 dollars spent by car sellers, driven in part by increased offerings of video advertising opportunities. Already, J.D. Power & Associates reports that car company websites generated about one in five car sales in 2004. Among the different parties advertising cars online, dealerships increased their 2004 spending the most, just about doubling internet budgets. Carmakers increased spending by about 39 percent, while dealer associations upped spending only about 20 percent.