Ok, so I was at BestBuy today, I will be upgrading my macbook next week. Right now I have a 1.83ghz 15.4" MBP. I noticed on the older version (aluminum 17" MBP) at best buy had the option to zoom in and out like the iphone with your fingers. I thought that was only available on the newer macbook and macbook pros. What am I missing here?