Replace the Display_Readers template with this ;
Code:
<!-- Thread Readers -->
<if condition="$show[whohasread]">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
<tr>
<td class="tcat" colspan="2">
<a style="float:$stylevar[right]" href="#top" onclick="return toggle_collapse('thread_readers')"><img id="collapseimg_thread_readers" src="$stylevar[imgdir_button]/collapse_thead_collapsed.gif" alt="" border="0" /></a>
$trtitle
</td>
</tr>
<tbody id="collapseobj_thread_readers" style="display:none;">
<tr>
<td class="alt1" colspan="2">
<span class="smallfont">$treaders</span>
</td>
</tr>
</tbody>
</table>
</if>
<!-- End Thread Readers -->