Remove casing from sausage, break up the sausage into pieces and cook in a skillet until brown and cooked through. Once sausage is cooked combine with the 2 jars of sauce and mushrooms in a pot and allow to cook on low for about 20 minutes. While your sauce mixture is cooking cook the ziti noodles as directed on the box. Drain out your noodles and then in a 13 x 9 pan spoon out a layer of the sauce mixture then a layer of noodles and then a layer of the mozzarella cheese. Continue to layer like you would a lasagna, your last layer should be cheese. Cook in oven at 350 degrees for a half hour.