Safari for Windows (for Mac)
In order to set a Hubble image as your wallpaper using Safari and Windows Vista, you must follow these steps.
1. Right-click on the image. Select
Save image to... Make note of the location where you are saving the image file. (In this example, it is being saved to the Downloads folder.)
2. Locate and open the folder where you saved your image.
3. Right-click on the file name. Select
Set as desktop background.
Safari for Mac (for Windows)
Command + mouse click on a Macintosh. A menu will appear. Select the option
Use Image As Desktop Picture.