Left/Right arrows - Using the left and right arrows above will scroll through photos.
Slider - Moving the slider above will allow you scroll through photos as your preferred speed.
Cursor keys - You can navigate left and right through the photos by using your left and right cursor keys on your keyboard.
Scroll wheel - If your mouse has a scroll wheel, move your mouse over the photos and scroll up and down on the scroll wheel. This will left you move left and right through the photos.
View images - Double click on an image to see a full size version.