Alright, even though i've done this fine in the past i've just come across one wierd side effect of having a fixed background in a div tag with overflow set to auto.
In Internet Explorer it appears fine, who woulda thought, and in Firefox it apears as a approx. 100px by 200px image that 'jiggles' when you scroll in the div.
Here is the link:
Here is the css:
Also i was wondering if there was a way to change the side the scroll bar was on, from the right to the left side of the div.