Making a background/graphic loop itself?

Hi

Just wondered, I'm going to put together a nice little background
for my webpage to go in the tables. I'm curious, how is it possible to
create the background equally on both top and bottom so it'll loop nicey?

Duplicate, flip vertical, cut in half, & flatten image. Do the same horizontally so that your sides match also if you want. This will give your background a kaleidoscope effect and will macth up seamlessly.

most software you use have something that will make images seamless...this will work well if it is a pattern that you are working with

If you have photoshop,

http://www.flamingpear.com/download.html

Download "Tesselation," it's a seamlessly repeating tile plug-in for photoshop.