I think you should upgrade your site also when you did not have any problems. There where a few security fixes in the upgrades you missed. So...
<IFRAME WIDTH=500 HEIGHT=500 frameborder="0" scrolling="yes">
<body background="images/layout_.gif">
<!-- Start center-center blocks loop -->
<!-- Display center blocks if any --> <body background="images/layout_.gif">
<{if $xoops_showcblock == 1}>
<table cellspacing="0">
<tr>
<td width="100%" colspan="2">
<!-- Start center-center blocks loop -->
<{foreach item=block from=$xoops_ccblocks}> <table cellspacing="1" cellpadding="5">
<tr>
<td class="blockTitle"><{$block.title}></td>
</tr>
<tr>
<td class="blockContent"><{$block.content}></td>
</tr>
</table>
<{/foreach}>
<!-- End center-center blocks loop -->
</td>
</tr>
<tr>
<td width="50%">
<!-- Start center-left blocks loop -->
<{foreach item=block from=$xoops_clblocks}> <table cellspacing="1" cellpadding="5">
<tr>
<td class="blockTitle"> <{$block.title}></td>
</tr>
<tr>
<td class="blockContent"><{$block.content}></td>
</tr>
</table>
<{/foreach}>
<!-- End center-left blocks loop -->
</td>
<td width="50%">
<!-- Start center-right blocks loop -->
<{foreach item=block from=$xoops_crblocks}> <table cellspacing="1" cellpadding="5">
<tr>
<td class="blockTitle"> <{$block.title}></td>
</tr>
<tr>
<td class="blockContent"><{$block.content}></td>
</tr>
</table>
<{/foreach}>
<!-- End center-right blocks loop -->
</td>
</tr>
</table>
<{/if}>
<!-- End display center blocks --></div>
<div align="left" id="content"> <{$xoops_contents}> </div>
<TD>
</IFRAME>
// Menu
$modversion['hasMain'] = 1;
$modversion['sub'][1]['name'] = _MI_NEWS_SMNAME1;
$modversion['sub'][1]['url'] = "submit.php";
$modversion['sub'][2]['name'] = _MI_NEWS_SMNAME2;
$modversion['sub'][2]['url'] = "archive.php";
// Menu
$modversion['hasMain'] = 1;
//$modversion['sub'][1]['name'] = _MI_NEWS_SMNAME1;
//$modversion['sub'][1]['url'] = "submit.php";
//$modversion['sub'][2]['name'] = _MI_NEWS_SMNAME2;
//$modversion['sub'][2]['url'] = "archive.php";