Croppic - How to repopulate?

I am using Croppic (http://croppic.net) and successfully uploading an image to the server, cropping it, saving the original image and cropped image to disk, and saving the Croppic positional values to a database.

I now want to let the user come back at some future date and re-edit their previously uploaded image, letting them perform the usual Croppic functions such as zooming and dragging. However I can't seem to be able to re-populate the Croppic javascript object so it looks exactly as when the user originally saved it.

Any ideas what the solution is please? (I am using C# ASP.NET but would be quite happy seeing a solution in any language)