Need swf?xml_source= for slideshow

Hey everyone.
I have a problem…In my html file, where I place the flash file, I need to put something like
src=“slideshow.swf?xml_source=images.php?slideshow=1”. I can’t figure out how to change the fla so that will work that way…I have tried looking on the internet but I just can’t figure it out…I want to have a bunch of slideshows, and so this way it will be easier than adding a bunch of swf files, one for each slideshow.
Thanks for any help:)