Remember that diets aren't just short term plans. You'll have to keep them up for a good while - even after you've reached your ideal weight - otherwise the weight will just pile back on.
Also exercise has to be an integral part of any diet, or you might find yourself putting weight on, rather than losing it. Do sit-ups and press-ups before you go to bed (30 should do, but you won't be able to do that many at first!). A half-hour daily power walk is also a great workout.
Good luck! It sounds so easy, doesn't it? ;-)