PHP 5.1.2 ISAPI and Mysql

ok folks, heres one for ya. IIS 6 (Win 2003 Ent) New installation (no possible reminants of an old php version, not that I haven't reverified) PHP 5.1.2 Mysql 5.0.18 PHP dir (c:\php) added to path. php.ini (from php.ini-dist) modified to for IIS (cgi.force_redirect = 0), php/ext dir (extension_dir=c:/php/ext) and mysql extension uncommented.(extension=php_mysql.dll) When I load the use the isapi for php and attempt to connect to the database, I get the message "cannot find mysql_connect....." as if the extension wasn't loaded. I have verified that it is loaded via phpinfo. In addition, I've changed the ext directory to point to where it is not located to verify that it is using the php.ini, and of course I receive an error, as expected (cannot find php_mysql.dll). All other aspects of php seem to work fine based on limited tests, as you would expect. The most confusing part is that if I use the php-cgi in IIS instead of the isapi, everything works perfect. (no other changes made). I could understand that if this was my first php 5 setup or I was just being stupid, but I dont see any reason for this to be happening and need a fresh outlook if anyone has any suggestions. Now normally when setting up php on IIS, I just use the cgi and call it good, as in the past there were possible stability issues, but as I've moved the site to a new server, I was hoping the isapi would preform a little better. comments? tips?