https://www.vtbreg.ru/local/templates/vtbreg/components/bitrix/menu/top/script.js

1var jsvhover = function()
2{
3	var menuDiv = document.getElementById("vertical-multilevel-menu");
4	if (!menuDiv)
5		return;
6
7  var nodes = menuDiv.getElementsByTagName("li");
8  for (var i=0; i<nodes.length; i++) 
9  {
10    nodes[i].onmouseover = function()
11    {
12      this.className += " jsvhover";
13    }
14    
15    nodes[i].onmouseout = function()
16    {
17      this.className = this.className.replace(new RegExp(" jsvhover\\b"), "");
18    }
19  }
20}
21
22if (window.attachEvent) 
23	window.attachEvent("onload", jsvhover); 
24
25$(document).ready(function(){
26	var timer;var timer2;
27   $("#navigation li.li_parent_1").hover(function(){
28	clearTimeout(timer);
29	$('#navigation div.li_parent_1').fadeOut(0);
30    $(this).find('div.li_parent_1').fadeIn(0);
31  }, function() {
32		timer = setTimeout(function() {
33			$('#navigation div.li_parent_1').fadeOut(0);
34		}, 500);
35  });
36
37   $("#navigation li.li_parent_2").hover(function(){
38	clearTimeout(timer2);
39	$('#navigation div.li_parent_2').fadeOut(0);
40    $(this).find('div.li_parent_2').fadeIn(0);
41  }, function() {
42		timer2 = setTimeout(function() {
43			$('#navigation div.li_parent_2').fadeOut(0);
44		}, 500);
45  });
46});