PHP4 + Oracle 8.0.5

[admin]

Hello,

I have Oracle client 8.0.5 + PHP 4 + Apache Server on Win NT and I can not connect to Oracle Databases using PHP.
I've included
extension=php_oci8.dll
extension=php_oracle.dll

the ORACLE_HOME is set to C:\orant

but the error that I received is :
Warning: _oci_open_server: ORA-12154: TNS:could not resolve service name in c:\a...

Thanks,
Camelia