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header("Expires: ".gmdate("D, d M Y H:i:s", mktime(date("H")-2, date("i"), date("s"), date("m"), date("d"), date("Y")))." GMT");
header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");
// THIS HEADER MUST BE OMITTED FOR IE 6+
if (FALSE === strpos($_SERVER["HTTP_USER_AGENT"], 'MSIE '))
header("Cache-Control: no-cache, must-revalidate");
// THIS IS THE LAST HEADER
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