[SDL] background / palette tricks

[neil at cloudsprinter.com]

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> And of course, before diving into that stuff, what kind of animation
> speed do you want?

this is an issue that can only be decided by playing around alot.. i dont want
something to distracting from the gameplay, but i dont want something
completley static and dull.. this is why perhaps just a simple slow pallete
changing effect, so things are moving but not so in your face.


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