example

<div class="btn-group">
                            <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
                                <span class="glyphicon glyphicon-chevron-right"></span> Small Blind </button>
                            <ul class="dropdown-menu" role="menu">
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/28bb.png");'>28 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/23bb.png");'>23-27 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/20bb.png");'>20-22 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/18bb.png");'>18-19 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/16bb.png");'>16 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/14bb.png");'>14 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/12bb.png");'>12 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/10bb.png");'>10 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/9bb.png");'>9 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/8bb.png");'>8 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/7bb.png");'>7 BB</a></li>
                                <li><a onclick='changeImageTwo("images/HU-vsFish/SB/6bb.png");'>6 BB</a></li>
                            </ul>
                        </div>