analyze popunder code script and find target url

I am looking for a programmer to look at a popunder code script I have scraped from a major porn site. The script is on one of my sites and works just fine (though it serves the urls defined in the script and NOT the one I want). I need a programmer to look at the code and find the bit of code to replace the url that is served in the popunder with my url. at the moment this is through some variables and I cannot find it myself this is really a 10 minutes job for somebody that knows what is doing. You will get a link to my site with the popunder script installed and just need to analyze the code and replace the target url with a url I give you