how to do three toogle checkbox?

i reallt need help. currently my checkbox only works for tow options. what if i have 3 options. default,1column,3column.

my html code

<div class="col-md-6">
                                <fieldset>
                                    <div class="form-group">
                                        <label class="control-label" for="label90">Layout Options: </label>
                                        <div class="controls">
                                            <input name="layout_options" type="checkbox" class="checkbox_switch" value="1" <?php echo set_checkbox('layout_options', '1', (bool) $site->layout_options); ?>>
                                        </div>
                                    </div>
                                </fieldset>
                            </div>

js

$(document).ready(function () {
                    $(".checkbox_switch").bootstrapSwitch({
                        size: "small",
                        onText: "Default",
                        offText: "3Column",
                    });
                });

currently it only display default and 3 column. what if i wanted to add one more which is '1 column' at the middle . can anyone help?