If you have access to your server settings, you can set the header to "expires" and the date. Or you can use the <meta>:
<META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 2008 08:21:57 GMT">
I'm not sure the meta version works anymore.
If you are willing to do some PHP then here is some code that will help you
[PHP]
<?php
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past
header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: no-store, no-cache, must-revalidate'); // HTTP/1.1
header( 'Cache-Control: post-check=0, pre-check=0', false );
header( 'Pragma: no-cache' );
?>
[/PHP]
Put this code on the very top of your html page. Rename that page to .php extension.
!!!! Make sure that there are absolutely no spaces before the above snippet. If there are you will get an error.