nd tooltip
                      </li>
                      <li id='tree2id2'>
                        item2
                      </li>
                      <li class='folder' id='tree2id3'>
                        Folder with some children
                        <ul>
                          <li id='tree2id2.1'>
                            Sub-item 3.1
                            <ul>
                              <li id='tree2id3.1.1'>
                                Sub-item 3.1.1
                  