Dahlan allegedly initiates a campaign of billboards against AlJazeera because (the billboard said, or falsely claimed) Aljazeera is up for sale to an Israeli businessman. Like Dahlan objects to selling the station to Israel? The man has sold his "soul" to Israel, for potato's sake. (thanks Dina)
PS The story was made up a few months ago in Israeli propaganda outlets to harm Aljazeera's image. What I know for sure is this: Haim Saban spoke to the Emir of Qatar and/or the Prime Minister and offered to buy Aljazeera for a hefty sum. But that was more than 4 years ago, and he was told no.