$(function(){
    var navigation = {
        next : function(id, type){
            if (typeof type == 'undefined') type = true;
            if ($(id + ' div div').length > 3){
                var nodes = $(id + ' div div.active');
                if (nodes.length){
                    for (var i = 0; i < nodes.length; i++)
                        nodes[i].className = 'item';
                    if (type){
                        var node = $(nodes[ nodes.length-1 ]);
                        var limit = 3;
                        if (!node.next().length){
                            node = $(id + ' div div:first').addClass('active');
                            limit = 2;
                        }
                        for (var i = 0; i < limit; i++){
                            if (node.next()){
                                node = node.next();
                                node.addClass('active');
                            }
                        }
                    }
                    else{
                        var node = $(nodes[0]);
                        var limit = 3;
                        if (!node.prev().length){
                            var list = $(id + ' div div');
                            node = $(list[ list.length-1 ]);
                            node.addClass('active');
                            limit = list.length % 3 - 1;
                        }
                        for (var i = 0; i < limit; i++){
                            if (node.prev()){
                                node = node.prev();
                                node.addClass('active');
                            }
                        }
                    }
                }
            }
        },
        prev : function(id){
            navigation.next(id, false);
        }
    };
    $('#twitter ul.navigation .prev').click(function(){
        navigation.prev('#twitter');
        return false;
    });
    $('#twitter ul.navigation .next').click(function(){
        navigation.next('#twitter');
        return false;
    });
    $('#blogs ul.navigation .prev').click(function(){
        navigation.prev('#blogs');
        return false;
    });
    $('#blogs ul.navigation .next').click(function(){
        navigation.next('#blogs');
        return false;
    });
});