Adjusting a very small fla file

Hello! For a actionscript expert this is a job of 5 minutes. The fla source file is very small and needs a little adjustement. There is a path to an external xml file hard-coded in the fla/swf file. But I need is dynamically. So the swf file should read the path to the xml file from the flashvars parameters. That's it. Thank you, Marc