<div class="sidebar collapse">
    <ul class="navigation">
        <li class="active">
            <a href="#" class="expand level-opened" id="second-level"><i class="fa fa-bar-chart-o"></i> Debit Note</a>
            <ul>
                <li><a href="<?php echo site_url('everbright/debit_add'); ?>">Add Debit Note</a></li>
                <li><a href="<?php echo site_url('everbright/debit'); ?>">Debit Note List</a></li>
            </ul>
        </li>
        <li class="active">
            <a href="#" class="expand level-opened" id="second-level"><i class="fa fa-bar-chart-o"></i> Credit Note</a>
            <ul>
                <li><a href="<?php echo site_url('everbright/credit_add'); ?>">Add Credit Note</a></li>
                <li><a href="<?php echo site_url('everbright/credit'); ?>">Credit Note List</a></li>
            </ul>
        </li>        
    </ul> 
</div> 
