<div class="dropdown">
        <button class="btn dropdown-toggle config_btn" type="button" data-toggle="dropdown" id="btn_baud">
            <span class="caret"></span></button>
        <u1 class="dropdown-menu" id="baudrate">
            <li><input type="hidden" value="250"/><a href="#">250 kBit/s</a></li>
            <li><input type="hidden" value="500"/><a href="#">500 kBit/s</a></li>
            <li><input type="hidden" value="1"/><a href="#">1 MBit/s</a></li>
        </u1>
    </div>

    <script>

    $(document).ready(function(){
             $("#baudrate li a").click(function() {
                baudrate = $(this).parent().find('input').val();
                alert(baudrate);
            });
        });
    </script>