Side images, like a border?

[Luky]

Hey,

I want to put two images on a skin im making on the sides. I'm sure you have seen them before, they are the borders on the side. The go all the way down the page on the left and right! I cannot figure out how to do it, it would be so much easier if vbulletins templating system had an option to display the page where you want it, then i would make a 3 collum table, but i cant. Can someone please help me?

Thanks.