Mercury Interactive Systems Inc has reported fourth quarter net profits of $574,000 against losses last time of $992,000 on turnover that jumped 165% at $4.1m; net profit for the year to December 31 was $1.4m, against a loss of $3.3m last time, on turnover that soared 200.1% to $13m. Net earnings per share were $0.05 in the quarter, $0.12 in the year.