At work we often need to host tons images from an alternative location, so as to not overwhelm our boxes with literally thousands of hits per second. This presents a small problem for the site that uses lots of css styling for background images. Since CSS currently doesn't support dynamic variables, a change to the alternative location url means changing lots of hardcoded paths. The question becomes, how do I pass in one value to my CSS document and echo it throughout, whereever an image call is made.
