THIS_SCRIPT is defined at the top of the php page, not some browser page, but in the actual code. Open up the file called forum.php that you downloaded from vbulletin.com to install on your server and you will see the line I am talking about.
I don't think (or rather, I don't know of the condition) you can do this for a CMS page. All those pages are using the content.php page and right now, if you are on a content.php page, the Home link is highlighted. I don't know what the condition is for a particular Article, which is what it sounds like you want to do. You'd have to look in through the code to figure that out and I haven't got that far into the CMS yet.
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