backgrounds and CSS

I would like to have a background repeated in the x axis and padded in the y axis, I've take a look at the specs
but I couldn't find how to do the padding part, is it posible ?
Thank you.

body {background-repeat:repeat-x; background-position:0% 50%;}

= 0% on the x axis (ie far left)
and 50% on the y axis (center)

That won't do it, maybe I didn't express myself correctly, what I wanted to do is stretch the background vertically and repeat it horizontally, I think it's not posible with CSS2.
Carpe diem

Ahh, stretch it.

I don't think you can do it, but there is a possible alternative:

create a <div> that is 100% height and 100% width, positioned absolutely 0/0. Create another <div> the same 100% width/height, pos 0/0, but make this higher in the z-index, and give it a background-color of transparent. Put all your page content in the second <div>. The first <div> now essentially acts as the page background.

Using Javascript
Calculate how many images you are going to need horizontally to fill the screen. And put that many into the background <div>. Calculate the page height in pixels and set all the images in the background <div> to that height.

You should now have what you were after...