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_s/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( 'h1' )[0],
menu = document.getElementById( 'site-navigation' ).getElementsByTagName( 'ul' )[0];
container = document.getElementById( 'site-navigation' );
if ( undefined == button || undefined == menu )
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', '' );
container.className = container.className.replace( ' main-small-navigation', ' main-navigation' );
} else {
button.className += ' toggled-on';
menu.className += ' toggled-on';
container.className = container.className.replace( ' main-navigation', ' main-small-navigation' );
}
};
// Hide menu toggle button if menu is empty.
if ( ! menu.childNodes.length )
button.style.display = 'none';
} )();