function downloadFile($filename, $mimetype='application/octet-stream') {
	if (!file_exists($filename)) die('Файл не найден');

	$from=$to=0; $cr=NULL;

	if (isset($_SERVER['HTTP_RANGE'])) {
		$range=substr($_SERVER['HTTP_RANGE'], strpos($_SERVER['HTTP_RANGE'], '=')+1);
		$from=strtok($range, '-');
		$to=strtok('/'); if ($to>0) $to++;
		if ($to) $to-=$from;
		header('HTTP/1.1 206 Partial Content');
		$cr='Content-Range: bytes ' . $from . '-' . (($to)?($to . '/' . $to+1):filesize($filename));
	} else	header('HTTP/1.1 200 Ok');

	$etag=md5($filename);
	$etag=substr($etag, 0, 8) . '-' . substr($etag, 8, 7) . '-' . substr($etag, 15, 8);
	header('ETag: "' . $etag . '"');

	header('Accept-Ranges: bytes');
	header('Content-Length: ' . (filesize($filename)-$to+$from));
	if ($cr) header($cr);

	header('Connection: close');
	header('Content-Type: ' . $mimetype);
	header('Last-Modified: ' . gmdate('r', filemtime($filename)));
	$f=fopen($filename, 'r');
	header('Content-Disposition: attachment; filename="' . basename($filename) . '";');
	if ($from) fseek($f, $from, SEEK_SET);
	if (!isset($to) or empty($to)) {
		$size=filesize($filename)-$from;
	} else {
		$size=$to;
	}
	$downloaded=0;
	while(!feof($f) and !connection_status() and ($downloaded<$size)) {
		echo fread($f, 512000);
		$downloaded+=512000;
		ob_flush(); 
		flush();
	}
	fclose($f);
}