save this as htaccess
Code:
AddHandler headered .htm
AddHandler headered .html
Action headered http://yoursite.com/wrap/wrap.php
then save this as wrap.php
Code:
<?php
$footer = "footer.html";
$file = $_SERVER["PATH_TRANSLATED"];
readfile($file);
readfile($footer);
?>
then place whatever html you want added to every html file in a file called footer.html