But even as jurors toiled Tuesday to determine if defendants Michelangelo Delfino and Mary Day libeled the company and two of its executives with sometimes nasty postings on Internet message boards, a bigger struggle — over the type and extent of any injunctive relief — may lie ahead for the lawyers and the judge.

The unusual case, marked by defendants who continue to post messages that criticize and insult the plaintiffs, their witnesses and their lawyers during the trial, has become an expensive test of wills with no easy way out.