<?
$agent = getenv("HTTP_USER_AGENT");

	if (preg_match("/MSIE/i", "$agent")) {
		$result = "You are using Microsoft Internet Explorer.";
		} else if (preg_match("Mozilla", "$agent")) {
		$result = "You are using Mozilla Firefox.";
		} else {$result = "You are using $agent";}

echo $result;
?>