how can i move a camera when i hold a button down but have the camera move back to it's original position when the button's let go

hey I’m making a third person shooter and I can’t seem to get the aiming down. It’s supposed to be where you hold in right click to aim and let go of right click to zoom out.

P.S. I’m awful at scripting so if this involves scripting (which it most likely will) please leave a picture or link or something of the script.

thanks

Here

http://wiki.unity3d.com/index.php?title=AimDownSights