Preheat oven to 350 degrees. Cook zita in boiling water until al dente; drain and put in large bowl. Mix together Ricotta cheese and half the mozzarella with the ziti. Cover bottom of 9x13 inch baking dish with half the spaghetti sauce. Spoon ziti mixture into pan. Cover with remaining spaghetti sauce. Sprinkle with Parmesan cheese and remaining mozzarella cheese. Bake 20-30 minutes.