If you like coding and are looking for a challenge, try the following. Now the menu items will be highlighted when you move your mouse over them, but wouldn't it be great if the menu item stays highlighted after you clicked it?

Also, if you move in the prezi to a specific path step, the corresponding menu item will be highlighted automatically. You have to use callbacks to accomplish this and it only works online or with a local webserver.

An example is at prezi.com/manual/transitions-tutorial/, created by developers of Prezi.com. Of course, you can have a look at the source code to learn how it was done.