Error with Absolute URLs

Hi, I keep getting errors on my websites, that contain absolute URLs, e.g. http://www.url.com/blah.html. With most, being in the folder of my website, it's fine, i can just add $_SERVER['DOCUMENT_ROOT'], but there's a script I use to display the network statistics of an IRC network, which is located on a different server, so i can't use the $_SERVER['DOCUMENT_ROOT'], I'm wondering if anyone has an answer to this. I'm almost to the stage of just asking the script owner if I can have it located locally, so i can use the $_SERVER['DOCUMENT_ROOT'] variable. It was working fine until the server admin updated to PHP 4.3.4, but he is not the best with PHP/HTML programming, so he can't help much. Hope someone can help. Thanks!