@ MagicThemeParks, try with this code:
Update:
XHTML Valid [Whithout tables]
Code:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>
$vboptions[bbtitle]
</title>
</head>
<body>
$header
$navbar
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
<tr>
<td class="tcat">
The requested URL was not found on this server.
</td>
</tr>
<tr>
<td class="alt1"><script type="text/javascript"
xml:space="preserve">//<![CDATA[
var GOOG_FIXURL_LANG = 'en';
var GOOG_FIXURL_SITE = 'http://YourSite.com';
//]]></script> <script type="text/javascript"
src="http://linkhelp.clients.google.com/tbproxy/lh/wm/fixurl.js"
xml:space="preserve"></script> Back to <a
href="http://YourSite.com"><b>home page</b></a> <br /><br /><script
type="text/javascript" xml:space="preserve">//<![CDATA[
google_ad_client = "pub-***********YOUR ID***********";
/* 728x15, creado 13/02/09 */
google_ad_slot = "9714452317";
google_ad_width = 728;
google_ad_height = 15;
//
//]]></script> <script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js"
xml:space="preserve">//<![CDATA[
//]]></script>
</td>
</tr>
</table>
$footer
</body>
</html>
Screenshot: