This is where you can adjust the behaviour of my picture viewer. In general you do not have to do anything here except make sure that your browser is allowing cookies as otherwise the viewer might not work.
The viewer tries to detect your screen resolution and saves it in a cookie. Subsequent calls to the viewer will then read the cookie and use the resolution information from the cookie to fit the pictures to your screen. If this should not work for you can adjust and save the settings here.
If the pics appear to be to tall for your screen, try to decrease the resolution height to make it fit. If they appear to wide, try to decrease the resolution width. If you seem to have spare room on your screen, try to increase the resolution settings accordingly.