function tree(id, comments_object) {
        advAJAX.setDefaultParameters({
        onInitialization : function(obj) { document.getElementById(obj.tag).innerHTML = "Przygotowanie, prosze czekać..."; },
        onLoading : function(obj) { document.getElementById(obj.tag).innerHTML = "Prosze czekać..."; },
        onSuccess : function(obj) { document.getElementById(obj.tag).innerHTML = obj.responseText; },
        onError : function(obj) { document.getElementById(obj.tag).innerHTML = "Error - no data file..."; }
        });

            advAJAX.get({ url: "?command=comments/comments_lista_data&id="+id+"&obj="+comments_object, tag: "comments_tree"+id });
            advAJAX.setDefaultParameters({});
    }

    function showHide(tree, button) {
        if(document.getElementById(tree).innerHTML!='') {
            document.getElementById(button).src='gallery/system/f_minus.gif';
        }
        else {
            document.getElementById(button).src='gallery/system/f_plus.gif';
        }
    }

    function treeClick(id, comments_object){
        if(document.getElementById('comments_tree'+id).innerHTML=='') {
            tree(id, comments_object);
            showHide('comments_tree'+id, 'comments_button'+id);
        }
        else {
            document.getElementById('comments_tree'+id).innerHTML='';
            showHide('comments_tree'+id, 'comments_button'+id);
        }
    }