Please note that official support for this menu version has now ceased. There are still plenty of users, though, and the forum is still running. Some of our long-time users may be able to help you out.
It's a straight upgrade... just replace your old mmenu.js with the new one. You don't have to, but I'd probably throw in an extra comma at the end of your style arrays, just keep track of the number of elements used by the current version.
