One Resizeable Image to Use as Background

I have many tables, forms etc., all of 'em are different sizes and what I want to do is to add a background image (the same) to all the elements. The thing is that it should fit all the elements, no repeating, just one good centered image that covers all the element in all the elements. Is there an easy way around?

Hmm, just to start, it is an issue to make one image fit one element already. And it is because the background image will not expand or shrink, it will be the same size always. So if the image is smaller than the object/window the image will repeat. Or you can stop the repeating, but it will look ugly most of the times. The other option would be to create an specific image for each element, but even though, the image will not resize with the element, so you should not use % sizes. And the last option would be to put the image behind the object: http://www.scriptingok.com/forum/t5_611-Resize-background-image.