contract_view_ul.php

<style>
    .nav>li>a, .nav>li>a:focus, .nav>li>a:hover {
        background-color: #d0d0d0;
        margin: 0 0px 2px; 0
    }
</style>
<ul id="tabs_left" class="nav nav-pills">
    <li id="l0" class="active"><a data-toggle="pill" href="#assembly_" class="btn-sm" onclick="enable1('asm');">Assembly</a></li>
    <li id="l1"><a data-toggle="pill" href="#mcode_" class="btn-sm" onclick="enable1('mcode');">Mcode</a></li>
    <li id="l2"><a data-toggle="pill" href="#bcode_" class="btn-sm" onclick="enable1('bcode');">Bcode</a></li>
    <li id="l3"><a data-toggle="pill" href="#desc_" class="btn-sm" onclick="enable1('desc');">Desc</a></li>
    <li id="l4"><a data-toggle="pill" href="#usage_" class="btn-sm" onclick="enable1('usage');">Usage</a></li>
</ul>