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AppleScript: Taking screenshots - tuaw.com
http://news.google.com/news/url?sa=T&ct=us/0-0&fd=R&url=http://www.tuaw.com/2008/07/07/applescript-taking-screenshots/&cid=0&ei=3pZySOPtHIf2_AGY2PHJBQ&usg=AFQjCNHjpQVldb1iZAXQ-5qSe5LG55frFw