This is the best way to view the photos on facebook according to me. If you are using Google Chrome to use the facebook then just click here and install Facebook Photo Zoom Plugin for Google Chrome Browser.
After Installing the Plugin, restart the browser and open facebook. Now when you place your cursor on any picture then it will load and zoom there itself for you.
This is the normal button of the photo zoom which says that the photo zoom plugin is on.
This button is present as a default beside left of the chat windows on facebook.