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One of the most common effects used on web pages is the image rollover. There are two problems associated with the effect:
First. They require a pre-load to work smoothly. That means scripting must be enabled, and each image must be separately addressed.
Secondly. The increase response times because of extra graphics have to be downloaded. Even if the graphics are small; there is still a separate request and disk I/O on the server 10 graphics that are 3k takes longer than 1 graphic that is 30k
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