 <li><a href="#transactionsPerSecond" onclick="exportToPNG('flotTransactionsPerSecond', this);">Save as PNG</a></li>
                                    </ul>
                                    <button type="button" class="btn btn-link btn-xs dropdown-toggle" data-toggle="collapse" href="#bodyTransactionsPerSecond" aria-expanded="true" aria-controls="bodyTransactionsPerSecond">
                                        <i class="fa fa-chevron-down"></i>
                                    </button>
         