$ext=substr($file,strrpos($file,'.')+1,strlen($file)-strrpos($file,'.'));
switch($ext){
	case 'html': $ctype='text/html'; break;
	case 'mpeg': $ctype='video/mpeg'; break;
	case 'avi': $ctype='video/quicktime'; break;
}
header('Content-type: '.$ctype);