I modified the theme "Legend", created by Christian Gundersson |http://www.gundersson.com, to only display the contents of the center block.
The code that goes in the <body> section of the file theme.html looks like this:
<table class="contentsection" cellspacing="0"> <tr>
<td class="middlerow">
<!-- Include file centerblocks.html if centerblocks are to be presented -->
<{if $xoops_showcblock == 1}>
<{include file="legend/centerblocks.html"}>
<{/if}>
<!-- Print the contents of the page currently showing -->
<{$xoops_contents}>
</td>
</tr></table>
I'm not a coder btw, so there may be a better way to do it then this. This seems to only display the contents of my tinycontent pages in the main frame of my frames bases site, and not the side menu or header etc.
Good luck!
Jeff