var next_picture = function(param_photo_id)
{
    move_pictures(param_photo_id, 1);
};

var prev_picture = function(param_photo_id)
{
    move_pictures(param_photo_id, -1);
};

var move_pictures = function(param_photo_id, param_direction)
{
    $.ajax({
        url: '/main/main/movepictures/',
        data : {
            photo_id    : param_photo_id,
            direction   : param_direction
        },
        success: function(json){
            $('#extreme_photo_band').html(json.content);
        }
    });    
};