function display_item(el) {
    var id_a = el.id.split('__');
    
    
    var cont_id = 'container_'+id_a[1];
    var cel = document.getElementById(cont_id);
    if (cel) {
        if (cel.style.display == 'block') {
            cel.style.display = 'none';
            set_class(el,'head-for-hiding');
        }
        else {
            cel.style.display = 'block';
            set_class(el,'head-for-hiding-open');
        }
    }
}