Get name of swf linked to an as file

Sounds simple enough. I have a number of swfs (quiz01.swf, quiz02.swf.....) all linked to one quiz.as file. The quizes in turn are loaded by another swf, Main.swf. I need to get the name of the specific quiz that is loaded, so I can identify an external xml file.

Tried using the "loaderURL" in the as, but it gives the name of the Main.swf. How can I just get the name of the swf that is associated with the quiz.as file?  Been working on this a long time and would appreciate any guidance.