if(isset($_SERVER['HTTP_RANGE'])) {
						list($a, $range)=explode("=",$_SERVER['HTTP_RANGE']);
						//if yes, download missing part
						str_replace($range, "-", $range);
						$size2=$size-1;
						$new_length=$size2-$range;
						header("HTTP/1.1 206 Partial Content");
						header("Content-Length: $new_length");
						header("Content-Range: bytes $range$size2/$size");
					} else {
						$size2=$size-1;
						header("Content-Range: bytes 0-$size2/$size");
						header("Content-Length: ".$size);
					}