Well since this is a PHP forum, i'll give you a PHP solution. You could pass the css file for the iframe to use in the url like so:
<iframe id="pframe" width="'.$game['iframewidth'].'"...

Try looking at this page (http://hudzilla.org/phpwiki/index.php?title=Advanced_text_searching).

<td width=""><p><?php echo wordwrap($message, 75, "<br />", true); ?></p></td> Change 75 to whatever width you want.

Put this:
if (!$user_check) {
die('Invalid query: ' . mysql_error());
}
in between this:
$user_check = mysql_query("SELECT userdb_user_name FROM default_userdb WHERE...