header("Content-type: image/png");
$stamp = gmdate("D, d M Y H:i:s", filemtime($filename)). " GMT";
header("Last-Modified: $stamp", true);
header("Content-type: image/png");
$stamp = gmdate("D, d M Y H:i:s", filemtime($filename)). " GMT";
header("Last-Modified: $stamp", true);