Global spending for advertising on the Internet was around US $18 billion
in 2005, up over 28% from the previous year. This compared with
around US $147 billion for television advertising, up about 4% ( Wall
Street Journal , 28 August 2006 ). Estimates are that online expenditures
could grow to US $150 billion by the year 2015 ( Guth, 2005b ). Much of
this growth is expected to come from web video adverts. While currently