75evo is right. You have a pump that is leaking around the little o-rings. I fixed that by taking the pump apart. Here's an illustration:
When you take off the two bolts (see extreme left) that hold the pump together, it will split into two - minus the pulley, which is at the right hand side of the picture
The seals are located around the little holes on the radius of the pump body, as pictured below:
Those o-rings are unobtainable, usually, but if you were lucky enough to find a shop that could match them to something already on the shelf, you'd be in fat city. However, since I wasn't so lucky, I put gasket sealant between the two halves of the pump, making sure none of the holes are covered with the goop, and put it back together.
I now have a power steering pump that doesn't leak, and works just fine. Cost of repair, $3 (for a tube of gasket sealant) plus a bit of my time.