Usually, you can't upgrade a laptops video card unless it is a modular system. Because of the constricted size of laptops, video tends to be integrated, so I would doubt that you can. You probably wouldn't see too much improvement going to an MR9700 anyway because it's just a slightly higher clocked MR9600PT.
EDIT: Missed the link...with that laptop, as with most, you cannot upgrade from the MR9600PT.