on value="baselayer">Mapa-base</option>
                            <option value="overlay">Cobertura</option>
                        </select></td>
                    </tr>
                    <tr>
                        <td>Preview</td>
                    </tr>
                </table>
                <div id="preview-map" style="width: 100%; height: 200px"></div>
                <div id="layer-creation-ok" class="panels custom-button normal-button">Add layer</div>
            </div>
            <div 