How do you change the screen background on Nexus S? Just bought a Samsung Nexus S. No manual came with it. Apparently the moving default screensaver eats up heaps of battery life and I am not getting much battery life out of this new phone and I am constantly recharging.

How do you change it to a non-moving image?
From the home screen, press the phone's Menu button. Here, there is usually a button for Wallpaper (it will be the top right button on the menu), where you should be able to pick your wallpaper (this applies to your background and lockscreen).