Here is an online utility that does a great job if you are in a rush and it from the same company that does Vector Magic. Just up load your photo roughly mark the bit that you want to keep then mark the background that you want to lose and download. I tried it with a complex pic in seconds and I was surprised how good it was. I could have spent time on the manual bit messed around with brush size and got the picture that I would have download but I was in a rush. Have a look it is worth your time: http://clippingmagic.com/