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function loadItems(url, params, callback) {
    $.ajax({
        url: url,
        dataType: 'json',
        contentType: 'application/json',
        data: JSON.stringify(params),
        type: 'POST'
    })
    .done(function (data, textStatus, jqXHR) {
        var result = ((typeof data) == "string") ? $.parseJSON(data) : data;
        return callback(null, result);
    })
    .fail(function (jqXHR, textStatus, errorThrown) {
        return callback(['fail', errorThrown], null);
    });
}