How do I change the variable inside a SWF using PHP

I'm using an XML file to provide the text and URL that the user will be using (it works fine)

now each XML file is in its own unique folder depending on the user

The issue is:

facebook caches the SWF file and NOT the XML, I have to specify the remote XML file in the swf for it to work

with each url/folder being different

My only solution would be to use "flackzi" (http://stackoverflow.com/questions/1354197/using-php-to-write-to-swf-files) 

and inject the users URL into the swf file.

Anyone have any suggestions on how to accomplish this? flackzi doesnt seem to be working.

Thanks in advance.