...the selector for my case ?

...the selector for my case ?

<tr>
<td>3</td>
<td class="tTB">Some text...</td>
<td class="tTB">Some text...</td>
<td class="tTB">Some text Some text Some text <span>SPEC. TEXT</span></td>
<td class="tTB">Some text...<span>SPEC. TEXT</span></td>
<td class="tTB">Some text...</td>
<td class="tTB">Some text...<span>SPEC. TEXT</span></td>
</tr>

question:
$('.tTB').live('click',function(){var SPECTEXT=$(this).??("span").html();});

How i get the "<span>SPEC. TEXT</span>" in the var?