thread statusicons alt text?

[medicalforums]

Yea, but where is the image?
I looked in threadbit template and here's the code

<tr>
	<td class="alt1" id="td_threadstatusicon_$thread[realthreadid]">
		$thread[openclose_editable]
		<img src="$stylevar[imgdir_statusicon]/thread$thread[statusicon].gif" id="thread_statusicon_$thread[realthreadid]" alt="<if condition="$show['threadcount']"><phrase 1="$thread[dot_count]" 2="$thread[dot_lastpost]">$vbphrase[have_x_posts_in_thread_last_y]</phrase></if>" border="" />
	</td>

Where should add the alt tag?