How to set include_path depending on the domain name

I have PHP installed on a WinNT computer with Apache web server. I have 2 different domains on the same machine (Virtual hosts in Apache). So my question is: Is it possible to have different include_path's, depending on which domain is used. Example: I want xx.com to have the following include path: include_path = ".;d:\www\xx\utils" I want yy.com to have the following include path: include_path = ".;d:\www\yy\utils" Lasse, Denmark