The judge in the David Westerfield case said yesterday that he has decided which prosecution witnesses will be allowed to testify at the penalty phas e of the murder trial, but he refused to be specific. Superior Court Judge William Mudd made his announcement following a closed-door hearing with the lawyers. He didn't identify the witnesses or the nature of their testimony. He simply said some prosecution witnesses "will testify, others will not". Westerfield was convicted last week of kidnapping and killing 7-year-old Danielle van Dam. She was discovered missing from her bedroom Feb. 2; her body was found more...