( function() {
	var container, button, body;

	container = document.getElementById( 'site-navigation' );
	if ( ! container ) {
		return;
	}

	button = container.getElementsByTagName( 'button' )[0];
	if ( 'undefined' === typeof button ) {
		return;
	}

	body = document.getElementsByTagName( 'body' )[0];


	button.onclick = function() {
		if ( -1 !== body.className.indexOf( 'sidebar-toggled' ) ) {
			body.className = body.className.replace( ' sidebar-toggled', ' sidebar-closed' );
		} else {
			body.className = body.className.replace( ' sidebar-closed', '' );
			body.className += ' sidebar-toggled';
		}
	};

} )();