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.

A "classpath" is apath of directories that Flash will search for external AS files. If the class defined in your authoring environment by the import method is found within that path, Flash will successfully compile that class into the resulting .swf file.

I hadn't even heard of this until tailing some apache logs turned up several dropped requests for a file called crossdomain.xml. With the advent of Flash Version 7, Macromedia introduced policy files that govern which domains a Flash movie is allowed to access data from.