function show_responses_for(post_id) {
    var expandedCookie = Cookie.read('expanded');
    if(!expandedCookie)
        expandedCookie = ',';
    var resp_block = $('p'+post_id);
    var el_togler  = $('toggler_'+post_id);
    if(resp_block.hasClass('collapsed')) {
        if(expandedCookie.substr(','+post_id))
            expandedCookie += ','+post_id;
        resp_block.addClass('expanded');
        resp_block.removeClass('collapsed');
        el_togler.set('text',  'zwiń odpowiedzi');
    } else {
        expandedCookie = expandedCookie.replace(','+post_id, '');
        resp_block.addClass('collapsed');
        resp_block.removeClass('expanded');
        el_togler.set('text',  'pokaż odpowiedzi');
    }

    Cookie.write('expanded', expandedCookie);
    return false;
}

var showTree = function() {
    var expandedCookie = Cookie.read('expanded');
    var resp_block;
    var el_togler;
    if($chk(expandedCookie)) {
        var items = expandedCookie.split(',');
        for(var i=0;i<items.length;i++) {
            resp_block = $('p'+items[i]);
            if(resp_block) {
                el_togler  = $('toggler_'+items[i]);

                resp_block.addClass('expanded');
                resp_block.removeClass('collapsed');
                el_togler.set('text',  'zwiń odpowiedzi');
            }
        }
    }
}