oth JPEG and GIF can be for the background of a Web page. They can be used as tiled background images whether than a uniform or plain background. Interesting backgrounds can be made by clever use of patterns. It's a good idea to keep the file size as small as possible, under 10KB. In addition, try to use the same background on all the Web site's documents. Be careful with tiled backgrounds; do not create strange backgrounds or those that distract the text and images on top of them.

Imagemaps have been one of the major innovations in web interactivity. They use a series of coordinates (hotspots) on an image as navigation to several links. An imagemap is a graphic image defined so that a user can click on different areas of the image and be linked to different destinations. Often imagemaps are used so that sites and their designers can show off some 'cool' graphics - they can be irritating, especially if they haven't bothered to supply any alternatives. Navigating such sites is a pain - having waited a considerable time for the image to download.

A GIF image with background a color that blends in with whatever color the background of your Web page. Some images look better this way. You can't do this by setting the background color of the image, since you can't control how people will configure their browsers. You can create this by using GIF89a images, which have the ability to mark a single color in the colormap as transparent.

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