Restore a previous version of a Prezi.

Hello, I have a prezi at the link below. I changed the theme and it auto saved, I then closed it and when I opened it again I can't undo the change. Would you restore the Prezi to the way it was prior to any edits today, January 26th 2012?

http://prezi.com/6z4p2m7j9tov/edit/#1...