[Sean S]

I'll recommend that you do some reading and learning more about HTML and CSS, but I'll try to summarize it for you as best as I can.

Basically you have to create a small image, that when repeated either in Y or X axis, it would look the same.

so for example, in the case of the design here at vb.org, it would be something like,

body {
background: url(pattern.gif) repeat-y top center;
}

the background calls for a background image
repeat-y, repeats the image you created in Y axis
top: starts the first image from the top
center: places the image in the center

hope that helps.