Here's my site: http://dev.shoeporn.com/
I'm running WP 3.5 and using this plugin: http://wordpress.org/support/plugin/responsive-select-menu
It is supposed to allow you to select which menus you want to be responsive, but it doesn't seem to work.
I only want the
<div id="header-bar"> menu to be displayed to mobile devices, but currently
<div id="header-nav"> is also shown.