It's also called a grapevine knot.
A video link to the one handed version is provided. It also has the basic steps of making this knot. Unique to the method on video is how an anchor hitch is formed first. Then it's rolled into a Fisherman's knot. http://www.youtube.com/watch?v=kZ28hDW04ZE
Here's an example of a working system, where the double fisherman is used to form a loop. In this case it will be a foot loop.
If you need some assistance with making a Prusik, this link can help: http://jimknowsknots.blogspot.com/2011/10/quick-prusik.html