PHP4 - OCI8 - Apache - NT4

Hi, I'm trying to connect to Oracle 8.0.5.2.1 using PHP 4.0.3 PL1 on an Apache 1.3.14 web server. For testing purposes I've installed the web server on my local NT 4 machine. The productive system is an NT 4 server. Oracle client is installed and the tnsnames.ora is o.k. The connect with SQLPlus works fine, but the OCI8 function calls do not work. The error message is: "Call to undefined function." I already read the recent threads and went through the PHP online documentation and all the comments, without success yet. I could not find what exactly I need to do to make the OCI8 functions run. Someone wrote his phpinfo page says that OCI8 is enabled. Mine doesn't even say that it is disabled. Although I'm not that far yet, I'll probably face the problem with the environment vars (ORACLE_HOME, ORACLE_SID etc.). I read several times that the env vars need to be set in the Apache startup script. I only know the httpd.conf and would not know where to place those entries. All those threads were referring to Linux. How is this with NT? Any help is very much appreciated. :-) Anabela