How do I write a conditional to determin if a module is in the center column?

How do I write a conditional to determin if a module is in the center column?

I want to have a different table head class for every module that is in the center column of the page. How wouldi write a conditional to determin if a module is in the center of a page?

So for example, i could have my adv_portal_module_shell Look like this:

<if conditional="IS CENTER COLUMN"> would be the conditional I am looking for.

$mods[formcode]

<if condition="IS CENTER COLUMN">
<table width="100%" class="tcat" border="0" cellpadding="0" cellspacing="0">
  <tr>
    <td width="88" height="26" align="left" valign="top"><img src="$stylevar[imgdir_misc]/cat_left.gif" alt=" " border="0" /></td>
    <td width="100%" class="tcat" align="center"><div class="smallfont"><strong>$vbphrase[whats_going_on]</strong></div></td>
     <td width="88" height="26" align="right" valign="top"><img src="$stylevar[imgdir_misc]/cat_right.gif" alt=" " border="0" /></td>
  </tr>
</table>
<table align="center" border="0" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" class="tborder" width="100%">
<else />
<table align="center" border="0" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" class="tborder" width="100%">
	<thead>
		<tr>
			<td class="tcat" colspan="$mods[colspan]">
			<if condition="$vba_style['portal_collapsemods']">
				<a href="#top" onclick="return toggle_collapse('module_$mods[collapse]')" style="float:$stylevar[right]"><img alt="" border="0" id="collapseimg_module_$mods[collapse]" src="$stylevar[imgdir_button]/collapse_tcat$modimgcollapse.gif" /></a>
			</if>
			<span class="smallfont"><strong>$vba_style[portal_blockbullet] <if condition="$mods['link']"><a href="$mods[link]">$mods[title]</a><else />$mods[title]</if></strong></span></td>
		</tr>
	</thead>
</if>
	<tbody>
		<if condition="$show['tablerow']">
			<tr>
				<td class="$bgclass">
					$modulehtml
				</td>
			</tr>
		<else />
			$modulehtml
		</if>
	</tbody>
</table>
<div><img src="$vboptions[bburl]/$vboptions[cleargifurl]" height="$vba_style[portal_vspace]" alt="" /></div>

<if condition="$mods['formcode']"></form></if>