4
Have a look in the theme.html
Look for something like this.
<{if $xoops_showcblock == 1}>
<table cellspacing="0">
<tr>
tr>
<td id="centerCcolumn" colspan="2">
<{foreach item=block from=$xoops_ccblocks}>
<{include file="themename/theme_blockcenter_c.html"}>
<{/foreach}>
td>
<tr>
<td id="centerLcolumn">
<{foreach item=block from=$xoops_clblocks}>
<{include file="themename/theme_blockcenter_l.html"}>
<{/foreach}>
td>
<td id="centerRcolumn">
<{foreach item=block from=$xoops_crblocks}>
<{include file="themename/theme_blockcenter_r.html"}>
<{/foreach}>
td>
tr>
table>
<{/if}>