The judge in the Polly Klaas murder case Wednesday ordered a television reporter and news director to reveal an anonymous source or face jail. At issue is a report that ran this month on San Jose television station KNTV. The story quoted an anonymous source as saying a videotaped confession by defendant Richard Allen Davis would be used as evidence. Most pretrial rulings on what will be admissible in the case have been sealed and a gag order forbids attorneys, law enforcement officials and witnesses from talking about evidence. Santa Clara County Superior Court Judge Thomas Hastings had already held one hearing on the report, which he called sleazy. On Wednesday he told reporter Beth Willon and news director Terry McElhatton they will be sent to jail if they do not reveal the source by Monday.