JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-1.6.4.min.js"></script>
<script src="http://code.jquery.com/mobile/1.0rc1/jquery.mobile-1.0rc1.js"></script>
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.0rc1/jquery.mobile-1.0rc1.css">
<div data-role="page" id="header">
        <div data-role="header">
            <h1>Sale Order</h1>
        </div>
        <div data-role="content">
            <!-- top level navigation bar -->
            <div data-role="navbar" id="nav1">
                <ul class="nav">

                    <li><a href="#" data-href="header" class="ui-btn-active">Header</a>
                    </li>
                    <li><a href="#" data-href="line">Lines</a>
                    </li>
                </ul>
            </div>
            <!-- /navbar -->
            <!-- top level header div which will also contain a navigation bar which will act as subtab menu for the header tab -->
           <div id="lns"> <!--here-->
           <div class="def_content_div" id="header">

                <div data-role="navbar" id="nav2">
                    <ul class="nav">
                        <li><a href="#" data-href="main" class="ui-btn-active">h1</a>
                        </li>
                        <li><a href="#" data-href="others">h2</a>
                        </li>
                    </ul>
                </div>
                <div style="border-top: 0px" class="ui-btn-active">&nbsp</div>
                <!-- DIVs associated with the header tab -->
                <div class="def_sub_content_div" id="main">
                    <p>Main fields</p>
                </div>
                <div class="sub_content_div" id="others">
                    <p>Others fields</p>
                </div>
            </div>
            <!-- Lines tab's DIV which also contains a navigation bar which acts as subtab -->
            <div class="content_div" id="line">
                <div data-role="navbar" id="nav2">
                    <ul...

CSS

/*This class of div will contain the subtab be hidden by default*/
.content_div {
    display: none;
}
/*This is the default subtab of a tab*/
.def_content_div {
    display: block;
}
/*This is the leaf div which will contain the form and the fields*/
.sub_content_div {
    display: none;
}
/*This is the leave div associated with the default subtab*/
.def_sub_content_div {
    display: block;
}
/*Following commented out as does not work*/
/*
.sub_content_div:first-child {
    display: block;
}

.content_div:first-child {
    display: block;
}
*/
.ui-btn {
    border-top-left-radius: 10px;
    border-bottom-left-radius: 10px;
    border-bottom: 0px;
}

#lns {
    margin-left: 43px;
    margin-top: -222px;
}


ul.nav,
.nav ul{

margin: 0;
padding: 0;
cursor: default;
list-style-type: none;
}

ul.nav{
width: 50px;
float: left;
margin-right: 1px;
}

ul.nav a{
color: #FFF;
}
ul.nav a:hover{
color: #FF0;
}
ul.nav>li{
margin: 0;
color: #FFF;
background-color: #900;
padding-top: 5px;
padding-right: 6px;
padding-bottom: 5px;
padding-left: 6px;
font-family: Arial, Helvetica, sans-serif;
}
ul.nav li>ul>li{
margin: 0;
color: #900;
background-color: #979700;
padding-top: 5px;
padding-right: 6px;
padding-bottom: 5px;
padding-left: 6px;
}
ul.nav li>ul>li a{
color: #FFF;
}
ul.nav li>ul>li a:hover{
color: #FF0;
}
ul.nav li:hover {
background-color: #000000;
color: #FF0;
background-image: url(../images/hover.jpg);
}

ul.nav li:hover>ul{
display : block;
color: #000;
}
ul.nav li>ul{
display: none;
position: absolute;
width: 200px;
left: 200px;
margin-top: -5px;
margin-left: 11px;
color: #FFFF00;
background-color: #000000;
}

ul.nav ul>li>ul{
display: none;
position: absolute;
width: 200px;
left: 191px;
margin-top: -5px;
color: #FFFFFF;
background-color: #333333;
margin-left: 9px;
}
ul.nav ul>li>ul>li{
margin: 0;
color: #FFF;
background-color: #000;
padding-top: 5px;
padding-right: 6px;
padding-bottom: 5px;
padding-left: 6px;
}
ul.nav ul>li>ul>li a{
color: #FFF;
}
ul.nav ul li ul li...

JavaScript

//Following event is added to the top level navigation bars/tabs
$('div[id="nav1"] a').live('click', function() {
    $(this).addClass('ui-btn-active');
    $('div.content_div').hide();
    $('div.def_content_div').hide();
    $('div#' + $(this).attr('data-href')).show();
    //The following line will show the div associated with the default subtab of the current tab (which was clicked)
    //e.g "main" is the default subtab for the "headers" tab.
    $('div#' + $(this).attr('data-href')).children('[class="def_sub_content_div"]').show();

});
//Following event is addred to the subtabs navigation bar which will show the div associated with it when clicked.
$('div[id="nav2"] a').live('click', function() {
    $(this).addClass('ui-btn-active');
    $('div.sub_content_div').hide();
    $('div.def_sub_content_div').hide();
    $('div#' + $(this).attr('data-href')).show();
});