A $15-million lawsuit by Nassau County's OTB against the New York Racing Association for halting its in-home simulcasting of races to Nassau County Cablevision subscribers is "frivolous," the racing agency says. NYRA halted the simulcasts June 3rd after finding that the Nassau Regional Off-Track Betting Corp. had been using them to stream on its Web site. Newsday is owned by Cablevision. OTB said in a statement Thursday that it had suffered financially because of the cutoff, and it blamed the improper use on its Web operator, Scientific Games Racing. NYRA said late Thursday that Nassau County OTB had "illegally pirated" its signal. "Now, rather than make simple amends to NYRA, which would immediately restore the NYRA picture in the homes of its customers, Nassau OTB is going to try and file a frivolous lawsuit against NYRA - which it will lose," the racing agency said in a statement.