Excellent idea. This is what I like about this forum.
I have already entered my gradient and can be viewed at
www.affordableweb.biz
What I did was to make the gradient shape and previewd(not published) and saved the image where I then inserted into the background of the page properties. I had to enlarge my image to 1024 x 850 (as my page height was 840).
Anyone viewing in screen res 800x600 will only see the white page but anyone viwing in screen resolution 1024x 768 or higher will see this white page centred in the screen with the gradients at the left and right.
Thanks anyhow.