I think you replace your highlightActiveMenuItem method to this:
highlightActiveMenuItem = function () {
var url = window.location.pathname.substr(6);
$('nav li a[href="' + url + '"]').parent().addClass('current');
if ($('nav li a[href="' + url + '"]').parent().parent().hasClass('sf-menu'))
{
$('nav li a[href="' + url + '"]').parent().addClass('selectedLava');
}
else
{
$('nav li a[href="' + url + '"]').parent().parent().parent().addClass('current selectedLava');
}
}
Or use specific class for item of top-level menu to avoid triple parent()