You need toadd some header "tag's", to stop browsers cacheing you homepage... There are 3 header lines you need to add to make ti 100% sure no browser, show the old output!
The problem is that i can't remember them in my head, bu i have answered it earlier in this mounth... searchon headers and Truti or take a look at php.net (http://dk.php.net/header)
there stand something like:
<?php
// Date in the past
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
// always modified
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
// HTTP/1.1
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
// HTTP/1.0
header("Pragma: no-cache");
?>