Change background for different resoloutions?

Is there any javascript/dhtml scripts to be able to change the background to different images according to the viewer's resoloution? :thumbsup:

I.E: I use 1024 x 768 res, but someone emailed me asking to change the background to be compatible with their res which was 1600 x 900... I want to be able to put in like 5 different images for 5 different resoloutions.

Is there a way to do this?
If not, please try to make one for me... :cool:
Email me if you want to; contact@comic-gate.com
Thanks