Unfortunately you can't do that with JPEG image. Because it is based in a lossy compression scheme (see: See: http://en.wikipedia.org/wiki/Lossy_compression) , you will always loose some data with successive Load/Save operations.
Maybe you can try to use the ExifTool free software from Phil Harvey. More info at http://www.sno.phy.queensu.ca/~phil/exiftool/
With best regards,
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