Actor Christian Bale (R) and director Christopher Nolan (arms crossed) are shown on the set of "The Dark Knight" in this undated publicity photo released to Reuters July 18, 2008. The film's robust performance in advance screenings bolstered projections that "Dark Knight" was headed for an opening weekend of $100 million or more in the United States and Canada.(Xinhua/Reuters Photo)

Actor Heath Ledger is shown in a scene in his role as The Joker in "The Dark Knight" in this undated publicity photo released to Reuters July 16, 2008. When the film began early screenings last month ahead of its U.S. debut on Friday, some moviegoers saw Ledger as an instant Oscar candidate. But Oscar watchers and veteran critics say the joke may be on fans who are creating what is mostly Internet-based buzz, because a posthumous Academy Award nomination would be a rare event
(Xinhua/Reuters Photo)

Actors (L-R) Chin Han, Michael Caine, Gary Oldman, Christian Bale, Maggie Gyllenhaal, Aaron Eckhart, Morgan Freeman, and director Christopher Nolan pose for photographers for the premiere of the film The Dark Knight in New York, July 14, 2008.(Xinhua/Reuters Photo)

(AFP/Agencies July 21, 2008)