[kh99]

He mentions New Thread, Edit, Quote, and Post Reply which are all images, at least in the style I'm using.

For example, a section of the SHOWTHREAD template is:

<!-- controls below postbits -->
<table cellpadding="0" cellspacing="0" border="0" width="100%" style="margin-top:$stylevar[margin_3px_fix]px">
<tr valign="top">
  <if condition="$show['largereplybutton']">
    <td class="smallfont"><a href="newreply.php?$session[sessionurl]do=newreply&amp;noquote=1&amp;p=$LASTPOSTID" rel="nofollow">
      <if condition="$show['closethread']">
        <img src="$stylevar[imgdir_button]/reply.gif" alt="$vbphrase[reply]" border="0" />
      <else />
        <img src="$stylevar[imgdir_button]/threadclosed.gif" alt="$vbphrase[closed_thread]" border="0" />
      </if></a></td>
  <else />
    <td class="smallfont">&nbsp;</td>
  </if>

and the part in red is the "Post Reply" button. (Unless I'm missing something).