Cutout this portrait (with Photoshop, GIMP or similar)

I have a portrait which is ok, but the background is dark. I would like to cut out the head and shoulders to have the very dark background replaced with (1) transparent and (2) white (ie, two images with that difference). I'd like jpeg or png formats returned (you choose). The image to work with is a 4MB jpg which I'll send to the successful bidder. However, a smaller version can be seen here: [login to view URL] (the image I provide will not have the drop shadow and it is not necessary to add a drop shadow).