A Whittier man and a teen-ager have been arrested on charges that they spray-painted a swastika and anti-Semitic slogans on a La Mirada synagogue, the Los Angeles County district attorney’s office said. Michael Warden, 18, pleaded not guilty at his arraignment in Downey Municipal Court on one count of felony vandalism for allegedly painting the red swastika on the Temple Beth Or on Nov. 18, district attorney’s spokesman Al Albergate said. Warden also denied two misdemeanor charges that he spray-painted swastikas and words on the sides of a motor home and house in the same neighborhood. He was being held in lieu of $5,000 bail, pending a preliminary hearing on Dec. 5. Charges were pending in juvenile court against his alleged 17-year-old accomplice, Albergate said.