Fixed background attachment problems

Hey everybody,
I’ll get right to the point here. I know my CSS, pretty well for the most part, but the thing is I am trying to fix another background image(aside from my main one I mean) to every page on my site and I just can’t seem to do it.
I just want this image to scroll with the user visiting the site. And I need it to be in the lower left of my page, but I can do that with relative positioning.
My friend has told me t put it in my document head, but my analytics code is in there which I believe is a rookie mistake.

I need some help here.

restated briefly:
I need a fixed image to stay in the lower left of all of my pages of my site.