Online gaming group PartyGaming fell into losses in the year to December 31 after paying costs for a non-prosecution agreement with the US authorities.The firm posted a net loss $26.5m in the year to December 31 having posted a profit of $66.1m the previous year.Its non-prosecution agreement resulted in costs of $105m, of which $15m was paid in 2009.Revenues fell to $444.7m from $472.9m as turnover from poker fell sharply, though this was offset slightly by a rise in casino and bingo revenues.'We delivered a solid performance during 2009 which demonstrated the resilience of our business model that continues to generate strong cashflow, even in the most challenging of circumstances,' said chief executive Jim Ryan.He said the company had performed in line with expectations in the first two months of 2009.