Easily Externaly Upgrading the Pictures in an FLA

I need to make an FLA that grabs JPGs externaly - which I know how to do - but the trick is: I need to have either a TXT file, or an XML file that tells the Flash which JPGs to load into the flash, and I know nothing about XML. Can anyone help me? Could anyone tell me some steps to do this, give me a link to a tutorial with a similar topic, or a sample file?

Thank you so much!