set the PHP to look at library files.

Hi, I am running PHP with apache. I put all my webpages in the htdocs folder. A lot of my scripts use a bunch of open source libraries. Until now I have been including these libraries in my scripts by defining a full path to the library 'inc' files. If I put the library itself in my htdocs folder I can see it. However, I want to simply include the library by saying: include ("xmlrpc.inc"); I don't want to put the absolute path in the include statement nor do I want to have the xmlrpc.inc file in the same directory as the script that needs it. Is there a some configuration setting in the php.ini file that I can set so that It always points to some path to look for the include files (It would be nice if the any thing below that path is also seen if I set the path. So if i set the path in the configuration to see /usr/home/ , even if i put something under /usr/home/install/.. I will be able to pick it up.) Thank in advance for any help. Moiz