find the line
Code:
<if condition="$show['avatar']"><td class="alt2"><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="$avatarurl" alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a></td><else /><img src="http://forums.tikigames.com/images/island_breeze/noavatar.gif" alt="No Avatar" border="0" /></if>
replace with
Code:
<if condition="$show['avatar']"><td class="alt2"><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="$avatarurl" alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a></td><else /><td class="alt2"><img src="http://forums.tikigames.com/images/island_breeze/noavatar.gif" alt="No Avatar" border="0" /></td></if>
You'd not got any <td> tags round the avatar if you didn't have one set.