UBB.threads PHP Forum Software Community Forums Resources and Customizing How Do I? Basic question on PHP and Post Islands

This could be a very basicly question but PHP is not my main stream...
I do have my index page on my server that is 'index.html'
I want to display a custom island on that page, that is this one below:
---------
<?php
if (!defined('UBB_MAIN_PROGRAM')) define('UBB_MAIN_PROGRAM',1);
$style_side="";$tbopen="";$tbclose="";
echo "<table width=\"100%\">";
include("/www/forum/languages/portuguese/portal_islands.php");
include("/www/forum/languages/portuguese/generic.php");
include("/www/forum/cache/post_island_12.php");
echo "</table>";
?>
-----------

The problem is that when I put it on my 'index.html' page, it display as a plain text.
If I change the name of my index to 'index.php' it display right

For a reason I don't want to start changing all my .html pages that will have custon islands, to be a .php pages.
What would be the work around?

Thank you

answering my own question, just in case you may need it:

For Apache Servers Edit your .htacess with AddType application/x-httpd-php .htm .html Then Add the php code from the reader directly to your html pages

.html files are not parsed by php, unless you explicidly set your server to do so; thus, php code in the index.html page will not parse as php code, it will show inline as regular text.

I would however recommend against doing this, as it will add overhead as all html/htm files will parse through php when they won't all have php coding in them; instead, utilize files with the .php extension when needed.