"$thread[field20]", is what I'm trying to call.
<tr>
<td class="alt1" id="td_threadstatusicon_$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>
<if condition="$show['threadicons']">
<td class="alt1 threadicon"><if condition="$show['threadicon']"><img src="$thread[threadiconpath]" alt="$thread[threadicontitle]" border="0" /><else /> </if></td>
</if>
<td class="alt1" id="td_threadtitle_$thread[realthreadid]" title="$thread[preview]">
$thread[title_editable]
<div>
<if condition="$show['taglist'] OR $show['moderated'] OR $show['deletedthread'] OR $show['paperclip'] OR $show['subscribed'] OR $show['sticky'] OR $show['rexpires']">
<span style="float:$stylevar[right]">
<if condition="$show['taglist']"> <img class="inlineimg" src="$stylevar[imgdir_misc]/tag.png" alt="$thread[taglist]" /> </if>
<if condition="$show['rexpires']"> <img class="inlineimg" src="$stylevar[imgdir_misc]/expires.gif" alt="<phrase 1="$thread[expiredate]" 2="$thread[expiretime]">$vbphrase[expires_on_x_y]</phrase>" /> </if>
<if condition="$show['moderated']"> <img class="inlineimg" src="$stylevar[imgdir_misc]/moderated_small.gif" alt="<phrase 1="$thread[hiddencount]">$vbphrase[x_moderated_posts]</phrase>" /> </if>
<if condition="$show['deletedthread']"> <img class="inlineimg" src="$stylevar[imgdir_misc]/trashcan_small.gif" alt="<phrase 1="$thread[deletedcount]">$vbphrase[x_deleted_posts]</phrase>" /> </if>
<if condition="$show['paperclip']"> <a href="#" onclick="attachments($thread[threadid]); return false"> <img class="inlineimg" src="$stylevar[imgdir_misc]/paperclip.gif" border="0" alt="<phrase 1="$thread[attach]">$vbphrase[x_attachments]</phrase>" /></a> </if>
<if condition="$show['subscribed']"> <img class="inlineimg" src="$stylevar[imgdir_misc]/subscribed.gif" alt="$vbphrase[you_are_subscribed_to_this_thread]" /> </if>
<if condition="$show['sticky']"> <img class="inlineimg" src="$stylevar[imgdir_misc]/sticky.gif" alt="$vbphrase[sticky_thread]" /> </if>
</span>
</if>
<if condition="$show['gotonewpost']"><a href="showthread.php?$session[sessionurl]goto=newpost&t=$thread[threadid]$thread[highlight]" id="thread_gotonew_$thread[realthreadid]"><img class="inlineimg" src="$stylevar[imgdir_button]/firstnew.gif" alt="$vbphrase[go_to_first_new_post]" border="0" /></a></if>
$thread[movedprefix]
$thread[typeprefix]
$thread[moderatedprefix]
$thread[prefix_rich]
<a href="showthread.php?$session[sessionurl]t=$thread[threadid]$thread[highlight]" id="thread_title_$thread[realthreadid]"<if condition="$show['gotonewpost']"> style="font-weight:bold"</if>>$thread[threadtitle]</a>
<if condition="$thread['pagenav']">$stylevar[dirmark]<span class="smallfont" style="white-space:nowrap">(<img class="inlineimg" src="images/global/multipage.png" width="auto" height="16px alt="$vbphrase[multipage_thread]" border="0" /> $thread[pagenav]<if condition="$show[pagenavmore]"> ... <a href="showthread.php?$session[sessionurl]t=$thread[threadid]&page=$thread[totalpages]$thread[highlight]">$vbphrase[last_page]</a></if>)</span></if>
</div>
<if condition="$show['rmanage']"><div class="smallfont"><span style="float:$stylevar[right]"><a href="postings.php?$session[sessionurl]do=editthread&t=$thread[redirectthreadid]">$vbphrase[manage]</a></span></div></if>
<div class="smallfont">
<if condition="$show['threadratings'] AND $show['threadrating']"><span style="float:$stylevar[right]"><img class="inlineimg" src="$stylevar[imgdir_rating]/rating_$thread[rating].gif" border="0" alt="<phrase 1="$thread[votenum]" 2="$thread[voteavg]">$vbphrase[thread_rating_x_votes_y_average]</phrase>" /></span></if>
<if condition="$show['guestuser']">
$thread[postusername]
<else />
<span class="$thread[field20]" style="cursor:pointer" onclick="window.open('member.php?$session[sessionurl]u=$thread[postuserid]', '_self')">$thread[postusername]</span>
</if>
</div>
<if condition="$show['unsubscribe']">
<div class="smallfont unsubscribelink">
<a class="unsbbutton1" href="newreply.php?$session[sessionurl]do=newreply&t=$thread[threadid]" rel="nofollow">$vbphrase[reply]</a> |
<a class="unsbbutton2" href="subscription.php?$session[sessionurl]do=removesubscription&return=ucp&t=$thread[threadid]" rel="nofollow">$vbphrase[unsubscribe]</a>
</div>
</if>
</td>
<if condition="$show['threadmoved']">
<td class="alt1 hideonmobile" align="center">-</td>
<else />
<td class="alt1 forumdisplayhide donthideatsearchresult" title="<phrase 1="$thread[replycount]" 2="$thread[views]">$vbphrase[replies_x_views_y]</phrase>">
<div class="smallfont tbitlastpost" style="text-align:$stylevar[right]; white-space:normal">
<a href="showthread.php?$session[sessionurl]goto=newpost&t=$lastpostinfo[lastthreadid]" style="white-space:nowrap" title="<phrase 1="$lastpostinfo[lastthread]">$vbphrase[go_first_unread_in_thread_x]</phrase>"><strong>$lastpostinfo[trimthread]</strong></a><br />
$thread[lastpostdate] <if condition="!$show['detailedtime']"><span class="time">$thread[lastposttime]</span></if><br />
<phrase 1="member.php?$session[sessionurl]find=lastposter&t=$thread[threadid]" 2="$thread[lastposter]">$vbphrase[by_x]</phrase> <a href="showthread.php?$session[sessionurl]p=$thread[lastpostid]$thread[highlight]#post$thread[lastpostid]"><img class="inlineimg" src="$stylevar[imgdir_button]/lastpost.gif" alt="$vbphrase[go_to_last_post]" border="0" /></a>
</div>
</td>
</if>
<if condition="$show['notificationtype']">
<td class="alt1"><div class="smallfont">
<label for="sub$subscribethread[$threadid]">$thread[notification]</label>
</div></td>
<td class="alt2"><input type="checkbox" name="deletebox[$subscribethread[$threadid]]" id="sub$subscribethread[$threadid]" value="yes" /></td>
<else />
<td class="alt1 srthidereplycount" align="center"><if condition="$show['threadmoved']">-<else /><a href="misc.php?do=whoposted&t=$thread[threadid]" onclick="who($thread[threadid]); return false;">$thread[replycount]</a></if></td>
<td class="alt1 srthidethreadviews" align="center">$thread[views]</td>
<if condition="$show['forumlink']">
<td class="alt1 srthideforumlink"><a href="forumdisplay.php?$session[sessionurl]f=$thread[forumid]">$thread[forumtitle]</a></td>
</if>
</if>
<if condition="$show['inlinemod']">
<td class="<if condition="$show['forumlink']">alt2<else />alt1</if> srthidemod">
<input type="checkbox" name="tlist[$thread[realthreadid]]" id="tlist_$thread[realthreadid]" value="$thread[checkbox_value]" <if condition="$show['disabled']">disabled="disabled"</if> />
</td>
</if>
</tr>