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Rollovers

As discussed earlier, one of the conventions that has arisen on the web, and which has come to be easily understood by users, is the concept of a navigation link changing in some way when the cursor rolls over it. This type of feature, when applied to an image, is known as a rollover.

A rollover actually consists of two images: the primary image, which displays when the page first loads; and the secondary image, which the browser substitutes for the primary image when the cursor moves across the primary image. The two images must be the same size. If they are not, the secondary image will be sized by the height and width attributes of the first image.


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