http://www.outlook.org.il/wp-content/themes/Tfisat_Olam_theme/js/navigation.js?ver=1.0

1/**
2 * navigation.js
3 *
4 * Handles toggling the navigation menu for small screens.
5 */
6( function() {
7	var nav = document.getElementById( 'site-navigation' ), button, menu;
8	if ( ! nav )
9		return;
10	button = nav.getElementsByTagName( 'h3' )[0];
11	menu   = nav.getElementsByTagName( 'ul' )[0];
12	if ( ! button )
13		return;
14
15	// Hide button if menu is missing or empty.
16	if ( ! menu || ! menu.childNodes.length ) {
17		button.style.display = 'none';
18		return;
19	}
20
21	button.onclick = function() {
22		if ( -1 == menu.className.indexOf( 'nav-menu' ) )
23			menu.className = 'nav-menu';
24
25		if ( -1 != button.className.indexOf( 'toggled-on' ) ) {
26			button.className = button.className.replace( ' toggled-on', '' );
27			menu.className = menu.className.replace( ' toggled-on', '' );
28		} else {
29			button.className += ' toggled-on';
30			menu.className += ' toggled-on';
31		}
32	};
33} )();