Seriously need Background Help

[SunderlandJ]

I am having great difficulty here..

I am trying to set my own custom image as a page background. I was told to put something in standard css background as something like:

#000000(http://pathtoyourimage)

which didnt work for me..

The image is located at

Please can someone tell me how to set this up so it displays behind the forums as a page background as it is really starting to get on my nerves