design template to fit any resoultion

I need to create a template that will look good in any resoultion. The goal is to have the banner top and bottom designs stretch 100% of the end users resoultion. For example, the banner design would not cut off if the user opened the course at 1024 by 769 if it was originally designed at 800 by 600 resoultion. Rather it would tile across the screen - See this site: http://ethics.trinity-health.org/Does anyone know how to do this? Any suggestions would be GREAT!

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