This is a pure css alternative that can be used to make a navigation which includes a large banner or image that scrolls up to reveal a navigation bar which always remains on the screen as you continue to scroll. You can download an html file with the base code for this which can be modified.
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Deviant Art: http://mikaristar.deviantart.com
Fanart Central: http://fanart-central.net/user/AzureMikari/