WordPress/wp-content/themes/twentytwelve/js/navigation.js

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JavaScript
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/**
* navigation.js
*
* Handles toggling the navigation menu for small screens.
*/
( function() {
var button = document.getElementById( 'site-navigation' ).getElementsByTagName( 'h3' )[0],
menu = document.getElementById( 'site-navigation' ).getElementsByTagName( 'ul' )[0];
if ( undefined === button )
return false;
// Hide button if menu is missing or empty.
if ( undefined === menu || ! menu.childNodes.length ) {
button.style.display = 'none';
return false;
}
button.onclick = function() {
if ( -1 == menu.className.indexOf( 'nav-menu' ) )
menu.className = 'nav-menu';
if ( -1 != button.className.indexOf( 'toggled-on' ) ) {
button.className = button.className.replace( ' toggled-on', '' );
menu.className = menu.className.replace( ' toggled-on', '' );
} else {
button.className += ' toggled-on';
menu.className += ' toggled-on';
}
};
} )();