U.S. companies that <A HREF="http://news.zdnet.com/2100-1009_22-6094051.html?tag=zdnn.alert">outsource their IT security functions</A> dramatically contributed to the volume of business sent overseas this year, according to a new survey. The survey, released Thursday by the Computer Security Institute and the FBI, revealed dramatic changes in 2006 in the volume of offshore IT security work. Of the U.S. companies that indicated they farm out their security functions, the amount of work sent overseas in some cases doubled year over year.