            <tr>
                    <td>Points Shape</td>
                    <td>
                        <select id="points" onchange="updateStyle()">
                            <option value="">none</option>
                            <option value="circle">circle</option>
                            <option value="square" selected="selected">square</option>
                        </select>
                    </td>
                </tr>
                <tr>
                    <td>Points Size</td>
 