@Planch -- While there are a ton of "gallbladder problems diets" out there, it's all pretty much the same thing.
You're going to want to avoid eggs, pork, milk, coffee, citrus fruits, alcohol, saturated fats, nuts, and partially hydrogenated oils.
Good foods for gallbladder problems include cucumbers and beets, green beans, fresh vegetables, and flax oil.
Of course, everybody is different, and these are just general guidelines. If you are really concerned about it I suggest you ask a doctor or see a nutritionist.