AdSense sotto la navbar: come limitarla agli utenti non registrati?

<!-- Pubblicità nei messaggi per i visitatori -->
<if condition="THIS_SCRIPT == 'showthread' AND  $post[postid] == $GLOBALS['qrfirstpostid'] AND (!$show[member])">

<if condition="$show['spacer']">
    </div>
    $spacer_close
</if>

<if condition="$show['spacer']">
    $spacer_open
    <div id="edit$post[postid]" style="padding:0px 0px $stylevar[cellpadding]px 0px">
</if>

<!-- BEGIN TEMPLATE: postbit -->
<table id="post$post[postid]" class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="0" border="0" width="100%" align="center">
<tbody>
 <tr>
  <td class="thead" style="font-weight:normal; border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-right: 0px" $post[scrolltothis]>        
            <!-- status icon and date -->
            <img title="Alt" class="inlineimg" src="images/statusicon/post_old.gif" alt="Alt" border="0"> Oggi
            <!-- / status icon and date -->                
    </td>
    <td class="thead" style="font-weight:normal; border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-left: 0px" align="$stylevar[right]">
    </td>
 </tr>
 <tr valign="top">
    <td class="alt2" width="175" style="border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-top: 0px; border-bottom: 0px">
            <div id="postmenu_$post[postid]">
                <span class="bigusername"><u><font color="#373737">Pubblicità</font></u></span>
                <br><br>

<!-- Google Adsense Annunci Code start -->

[...]

<!-- Google Adsense Annunci Code end-->

            </div>
    </td>
    <td class="alt1" id="td_post_$post[postid]" style="border-right: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]">
  <!-- icon and title -->
            <div class="smallfont">
                <img title="Post" class="inlineimg" src="images/icons/icon1.gif" alt="Beitrag" border="0">
                <strong>Collegamenti sponsorizzati</strong>
            </div>
            <hr size="1" style="color:$stylevar[tborder_bgcolor]" />
            <!-- / icon and title -->
        <!-- message -->
        <div>
    
        </div>
        <!-- / message -->
        <!-- sig -->
            <div>
Questa pubblicità non è visualizzata dagli utenti registrati.            </div>
        <!-- / sig -->
    </div>
        <!-- / message -->
    </td>
</tr>
<tr>
    <td class="alt2" style="border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-top: 0px">
      &nbsp;
    </td>
    <td class="alt1" align="$stylevar[right]" style="border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-left: 0px; border-top: 0px">
   &nbsp;
    </td>
</tr>
</tbody></table>
</if>
<!-- Pubblicità nei messaggi per i visitatori -->