1. Internet Explorer: Position your mouse cursor over the image. Press the right mouse button, select "Set as Background" from the pop-up menu.
2. Mac OSX: Drag the image to your desktop. Go to System Preferences and open the Desktop icon. Drag the image into the well.
3. Firefox, Chrome and Safari: Right-click at the bottom of the page and you'll find options like "Set as desktop background" or "Save image as".
a. Firefox: right-click on the image, select "View page info", go to the "Media" tab and find the JPEG image in the list. Then you can save the image and set it as a wallpaper.
b. Google Chrome: you need to right-click on the image, select "Inspect element", find the last img tag from the page, right-click on the URL, select "Edit attribute" and copy the address using Ctrl+C. Now you can open the *++image in a new page, save it and set it as a wallpaper.
c. Safari: Enable the developer menu in the settings, go to the "Develop" menu, select "Show Web inspector" and copy the address of the image from the page.