Possible to read JavaScript results into a string?

I have an external JavaScript that I use on several of my sites. It returns a web counter and does some other logging. It's accessed like this: <script language="javascript" src="http://www.mydomain.com/log.js"></script> No rocket science there, this is common and it works great. That call returns a block like this: document.write('<a bunch of html>') What I want to know is: is it possible to retrieve the above outputted code into a string, rather than outputting it directly to the browser? Nothing I've tried works, and I also tried this using a Google AdSense call to make sure there was not a problem in my JavaScript. Here's what I tried and what happened: <?php $x = file_get_contents('http://www.mydomain.com/log.js'); // also tried urlencode() but that did not help ?> The result: Warning: main(http://www.mydomain.com/log.js) [function.main]: failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request in c:\Inetpub\wwwroot\test.php on line 2