Are you basically asking how to have nested tabs? If so, simply define two instances of Tab Content script, with the second instance contained inside one of the content DIVs of the first. I've modified the 1st demo on the script page to illustrate this below:
Code:
<h3>Demo #1- Basic implementation</h3>
<ul id="countrytabs" class="shadetabs">
<li><a href="#" rel="country1" class="selected">Tab 1</a></li>
<li><a href="#" rel="country2">Tab 2</a></li>
<li><a href="#" rel="country3">Tab 3</a></li>
<li><a href="#" rel="country4">Tab 4</a></li>
<li><a href="http://www.dynamicdrive.com">Dynamic Drive</a></li>
</ul>
<div style="border:1px solid gray; width:450px; margin-bottom: 1em; padding: 10px">
<div id="country1" class="tabcontent">
Tab content 1 here<br />Tab content 1 here<br />
</div>
<div id="country2" class="tabcontent">
Tab content 2 here<br />Tab content 2 here<br />
<ul id="statetabs" class="shadetabs">
<li><a href="#" rel="state1" class="selected">Tab 1</a></li>
<li><a href="#" rel="state2">Tab 2</a></li>
<li><a href="#" rel="state3">Tab 3</a></li>
</ul>
<div id="state1">
NY
</div>
<div id="state2">
WA
</div>
<div id="state3">
TO
</div>
<script type="text/javascript">
var states=new ddtabcontent("statetabs")
states.setpersist(true)
states.setselectedClassTarget("link") //"link" or "linkparent"
states.init()
</script>
</div>
<div id="country3" class="tabcontent">
Tab content 3 here<br />Tab content 3 here<br />
</div>
<div id="country4" class="tabcontent">
Tab content 4 here<br />Tab content 4 here<br />
</div>
</div>
<script type="text/javascript">
var countries=new ddtabcontent("countrytabs")
countries.setpersist(true)
countries.setselectedClassTarget("link") //"link" or "linkparent"
countries.init()
</script>
<p><a href="javascript:countries.cycleit('prev')" style="margin-right: 25px; text-decoration:none">Back</a> <a href="javascript: countries.expandit(3)">Click here to select last tab</a> <a href="javascript:countries.cycleit('next')" style="margin-left: 25px; text-decoration:none">Forward</a></p>
<hr />
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