Camera zooming in and out

Hey guys im making a 3rd person game and i wanted to make it so when you use the scrolling thing on your mouse it zooms in on your player and out again. Im sure this question has already been asked but i cant find it.

Thanks

http://answers.unity3d.com/questions/30997/is-it-possible-to-add-zoom-to-the-mouse-orbit-script

Got it off your tag "zoom" just so you know...