Prosecutors Rewrite Script in New Trial of 2 at Tyco
Prosecution makes opening arguments in second fraud trial of former Tyco executives L Dennis Kozlowski and Mark H Swartz; drop most striking accusations of lavish spending that they concentrated on during first trial and focus instead on laying out core theme of their case: that two men illegally awarded themselves millions of dollars in bonuses and concealed them from company's board and shareholders; among people in gallery is Ruth Jordan, who received threatening letter while deliberating as juror in first trial, prompting judge to declare mistrial; photo (M)