Re: Slanting Staircase
A lot of your choices is going to depend on how much money you want to spend correcting the problem. If the foundation has settled there are companies the can jack and stabilize the foundation. They do this by driving screw rods into the ground beside the foundation all the way down to bed rock. The attaching a lift plate to the screw rod and jacking the foundation. Another method is to jack up the house and leveling it and installing shims to keep it level. Another is by installing the jack posts as Tim suggested.
Be sure you live your life, because you are a long time dead.-Scottish Proverb