Don't land on 'ur camera!
Have experimented with single fisheye images in the past but ran into viewer problems....had not seen Fisheyeplayer (thanks Holger and Smooth) which could have saved me hours, days, months!!! My solution then was to make a 2 scene sphere which for fun I've just repeated here using your image twice
You have to use a viewer that allows unrestricted movements (panoexpress here). Your image was simply remapped in photoshop using 'polar to rectangular'. Now I hope this link works for you Smooth after my sphere effort last time as it's my bed time.