Best I can think of is right click the background image and save on my computer and then upload it to Tinypic.com or something and use it myself, thats what I would do, but seeing as you wanna use it for another website, I think you need to go and edit the layout and background of your site and then paste in the direct link of the background image into there or something and it might come up?

EDIT:

I don’t think it should be illegal if you’re using it as your background, UNLESS it has the ‘damagedscene’ logo on the background or something, then it might be considered as theft of a background or something along those lines lol, but nothing illegal really, just find another background if it does have their logo on it, if not then you’re are fine. A whole lot of layout websites use other people’s backgrounds and codes anyway, they just make the layouts thats all Glad it worked by the way.