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you should look into the xoopsversion.php within the module dir. remember the block's show_func and template
then , in your php file, add such code
$block = $show_func(param);
$xoopsTpl->assign("block", $block);
finally add the template's source into your theme.html as ur will
if the smarty variable "block" is confilcted with others, your can change them.