IMO http-equiv is mostly used for IE only and still does fail in IE
if you have server-side scripting support like SDE says, you should think about using something like PHP
PHP Code:
<?php
header('Cache-Control: private, pre-check=0, post-check=0, max-age=0');
header('Date: '.date('D, d M Y H:i:s \G\M\T', (time()-date('Z'))));