Where to change upload_tmp_dir ini setting

Hi, This page: http://www.php.net/manual/en/function.ini-set.php tells me that upload_tmp_dir is of level PHP_INI_SYSTEM and can therefore only be altered in php.ini or httpd.conf I want to be able to set this by virtual host. My httpd.conf <include>s a directory which contains seperate files for each virtual host and in one of these I have added: <IfModule mod_php4.c> AddType application/x-httpd-php .php3 AddType application/x-httpd-php .php AddType application/x-httpd-php-source .phps php_admin_value upload_tmp_dir "/path/to/upload/directory/" </IfModule> ... and it has absolutely no effect. I have restarted apache using apachectl graceful and stop/start but it makes no difference. Files uploaded using POST get put in /var/tmp I also tried it with php_value instead of php_admin_value. Any guidance would be appreciated. PWR.