Pensacola Light House Ghost

Janel Gilkey of Navarre Beach, Florida sent us this picture. Is it a trick of the decide:

"We went to the Pensacola light house on Jan 5, 2006, and captured this picture inside the lighthouse of my mother-in-law with what seems to be someone in the middle of the staircase. These pictures were shot one after another with a digital camera, and the blurry one was the only picture on the whole camera that had the blur to it. Are we just seeing things?"