Strange Arm Ghost Picture

Tracey sent us this strange ghost picture of an arm in the upper right of the photograph. We wonder if it is ghostly or if somehow a double-exposure or lengthened exposure of some sort occurred...

"This photo was taken by my mother-in-law on 9-9-07...with a Samsung e350 camera phone. ItĀ seems to show an apparition's arm, hand and head to the right. Only the subject was seen during the photo being taken, although many anomalous things have been happening in her home...i.e. poltergeist type phenomena."

Is it a ghost or did the man's arm and hand somehow become transposed over top of this photo?