INSTRUCTIONS:
PC: Right click on image and 'Set as Background' or 'Set as Wallpaper'
MAC OSX: Drag the image onto your desktop. Go to System Preferences. Then go to the Desktop icon and open it. Then drag the image into the well.
MAC OS9: Drag the image onto your desktop. Go to your Control Panel and select Appearance. Click 'set desktop' and choose your new desktop.