Authentication

Hi guys… how im gonna change this into input box not prompt input box? any ideas how guys? thanks for the replies guys…

<? 
function auth () { 
Header("WWW-Authenticate: Basic realm=\"ArmFN public site\""); 
Header("HTTP/1.0 401 Unauthorized"); 
echo "You have to authentificate yourself first 
"; 
exit; 
} 
$pass = $PHP_AUTH_PW; 
$user = $PHP_AUTH_USER; 
auth(); 
} 
} 
?>