Depth of Field in Photoshop: Help!

[pc-modd]

I have been trying all morning following a few guides but I can't seem to do it what so ever! It just looks poor .

So if anyone can point me in the diection of a easy to follow tutorial for CS3. It must be simple as I cant use PS to save my life.

OR..

You could do it for me

Here is the pic:

http://www.megaupload.com/?d=EMWXV0QS

File size is 2.2mb

Thanks