on>
                            <option value="10">10</option>
                            <option value="15">15</option>
                            <option value="20">20</option>
                        </select>
                    </td>
                </tr>
                <tr>
                    <td>Points Color</td>
                    <td>
                        <select id="pointcolor" onchange="updateStyle()">
                            <option value="stroke:green;">green</option>
              