PC Instructions
Step 1: Click on the 'download' links above to select the image you want to download.
Step 2: "Right click" on the image and choose either "Set as Background" (in Internet Explorer) or "Set as Wallpaper" (in Netscape).  

Mac Instructions
Step 1: Click on the link above to select the image you want to download.
Step 2: Click and hold on the enlarged image and select "Save image," or "Download image."
Step 3: Navigate to your desktop pictures folder, and save the image.
Step 4: Go to Appearances control panel to select your wallpaper.