Vertical Menu Plugin

Hi, I’m seeking a vertical menu plugin to use with wp 3.4.1 – theme Twenty Eleven (child)

I like the one at:

http://wizardinternetsolutions.com/plugins/vertical-menu-widget/

but it’s only compatible up to wp 3.1.4.

If I try and active it I get a

Plugin could not be activated because it triggered a fatal error.

Error Message.

Any suggestions as to where I might get a vertical menu plugin that will work with wp 3.4.1?

Thanks