footers

I'm a newbee with xhtml. I'm looking for a substitution for word processor documents, but I have problems with footers. I'd like to have footer at the bottom of every page regardless of that, how many content is there (there are always problems with last page footer).

Thanks for an answer!
Greg [Slovenia]

DOCUMENT.php:

<?php
require_once("XHTMLClass.php");

$MyXHTMLDocument = new CreateXHTMLDocument; // Create New Class

$MyXHTMLDocument -> Header (); // Create Header

include ("content_for_main.php");
// or include ("content_about_us.php");
// or other content

require_once("FOOTER.php");

$MyXHTMLDocument -> DocumentEnd (); // Create Document End
?>

//-----------------------------------------------------------------
FOOTER.php:

<?php
echo '<div style="float: none; clear: both; text-align: center">
<address>
<a href="../People/Raggett/">Dave Raggett</a>,
<a href="../People/Arnaud/">Arnaud Le Hors</a>,
contact persons for the <a href="Activity">W3C HTML Activity</a><br />
$Date: 1999/12/24 23:37:50 $
</address>
</div>';
// http://www.w3.org/TR/REC-html40/struct/global.html
?>