addition to style sheet location url

[squishi]

The template engine prints this into the html pages:

PHP Code:

<style type="text/css" id="vbulletin_css">
/**
* vBulletin 3.7.0 CSS
* Style: 'My Style 1'; Style ID: 4
*/
@import url("clientscript/vbulletin_css/style-e1f0d32e-00004.css");
</style> 


What I want to do is add "/forum/" in front of the "clientscript" above, so that the css will work on my external pages.

How do I do that? I suppose it will require changing a php file?