2600 calorie diet plans

Hi Ive been working out since april 9 2010, I am a female @ 5 11 i started at 259 pounds its august and now I am 217 pounds I work out 5 to 6 days a week I lift weight Monday wen fri and do 30 min intervals on them and do a insanity class on my days off. I try to eat the right things most of the time how many calories do i need to eat in order to lose like 40 pounds? and maintain it?

I went from 330 pounds to 308 pounds, and now my weight is at a standstill. Im working out 2 to 3 times a week, counting calories, and eating healthy. I still cant seem to drop the weight. My calorie intake for today was 1568, and I burned 600 at the gym. What do I need to do to reach my goal?