In what is being hailed as a triumph for dependent cinema, Sony Pictures' A Perfect Alibi, a $90 million Mel Gibson-Cameron Diaz thriller, topped the weekend box office with an impressive $39 million take. 'This just shows what can be accomplished when you've got a major studio's backing and distribution,' executive producer Don Murray said Monday. 'Contrary to what some in the movie business would have you believe, there is a place for big, non-character-driven pictures.' Murray said he hopes the film's success serves as an inspiration to established, bankable actors and directors. 