function showRegion(address) {
$("#region").val(join([
join([address.region_type, address.region], " "),
join([address.area_type, address.area], " ")
]));
console.log(join([address.city]));
}
console.log(join([address.city]));
Москва, то if (join([address.city]) == Москва) {$('#ID_51').toggleClass('hidden');}
if (something.toLowerCase() === 'москва') {
$('#ID_51').hide();
$('#ID_50').show();
} else {
$('#ID_51').show();
$('#ID_50').hide();
}