https://g.cz/sites/all/themes/gflex/js/overlay.js?tfqhx8

1jQuery(document).ready(function ($) {
2  window.onload = function() {
3    var navMenu = document.querySelector('.close-overlay-menu'),
4      naviMenu = document.querySelector('.topics'),
5      overlay = document.querySelector('.overlay-container'),
6      body = $('body'),
7      html = $('html');
8
9    // navMenu.addEventListener('click', HideSearchMenu);
10
11    // naviMenu.addEventListener('click', ShowSearchMenu);
12
13    function ShowSearchMenu() {
14      noScrolling();
15      overlay.style.display = 'block';
16    }
17
18    function HideSearchMenu() {
19      scrolling();
20      overlay.style.display = 'none';
21    }
22
23    function noScrolling() {
24      body.height('100%').css('overflow', 'hidden');
25      html.height('100%');
26    }
27
28    function scrolling() {
29      body.height('').css('overflow', '');
30      html.height('');
31    }
32  };
33
34});