i picked the code apart and it seems to me that the only way you can configure which domain it *shares* you would need access to the .swf file, and for that you would need to de-compile it.
if anyone else wants a crack at this script, try to de-compile this swf
i could be wrong, but I looked through the other code and js files, didn't find anything really much related and didn't show any kind of indicators that points to his "2" php page i never really touched on js much but im bored and this looks challenging, will come back to this.