04. Image Sprites

The collection of images placed in a single image is known as an image sprite.

The idea is to have this single image changes position as the user's mouse change state. The user's act of moving over is called rollover.

So why use a single image sprite rather than three separate images. Simply put, it saves the user bandwidth and reduces the number of server requests.

Here is the breakdown of how it works:
  1. Set the background image for the link/button, but set the background-size to have just enough space to show just one of the images.
  2. When the user hovers over the image, position the image up so that the other active state image is shown.
  3. Now there just enough space for that new button, so the other buttons are hidden.
  4. The effect we get is that the link changes image as the user changes his or her mouse state.

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