Do you mean Javascript? If so I wasn't aware there was any Javascript in the that particular code but either way I took the original code twentythirteen template code:
<h3 class="menu-toggle"><?php _e( 'Menu', 'twentythirteen' ); ?></h3>
and modified it in a child theme / new theme. I then went into functions.php and registered new nav menus and locations and then setup the contents of those nav menus in the wordpress dashboard.
I also looked at functions.js to see whether anything in there was determining how the menu toggle displayed but I couldn't see anything.
Thanks for any help you can provide