After releasing a teaser site for the "Batman Begins" sequel, "The Dark Knight," WB has launched a guerilla campaign for the film.First they launched a teaser picture that will start a mock campaign for "Harvey Dent for D.A." Harvey Dent, who eventually becomes Two-Face, will be an upcoming D.A. in the film and will be played by Aaron Eckhart. The picture can be found at Ibelieveinharveydent.com.However, soon an alternate site that is supposed to be "The Joker's Website" appeared, called ibelieveinharveydenttoo. It starts with a defaced version of the "Dent for D.A." pic, which slowly fades into a ghostly image...