External .as files?

I’m working on a web based Flash game where all files are located on one server, and the main swf file is embedded on a 3d party web site. No problem so far, but after the main movie is embedded on Server 2, how will it be able to access the supporting .as files on Server 1? Would it work to add the URL of Server 1 in the classpath, or does this require a more complicated solution?