I saw recently on another IPB-based forum that they had some kind of method of changing the background - basically, a text box on the site, you paste in the URL to an image, and then hit enter and it changed the background (on the fly - didn't even have to reload the page).

Somehow it was possible, so I'm wanting to know if it's possible and easy to do with just a bit of coding. I do believe it stored the path in a cookie, so that would be the best way, yes?

If anyone is willing to have a go, please do. I really want to know if it's somehow possible.