open_basedir and safemode-ish things

I looked through the archives, and tried finding info in the PHP manual, but haven't had much luck. I'm looking for a way to restrict virtual host users to their specific little directory by putting a <Directory> thing in my httpd.conf. It looked like open_basedir should do the trick, but it didn't, and obviously something's not quite right. My php.ini has: safe_mode = off safe_mode_exec_dir = for safe mode stuff, while in a virtual host spot in my httpd.conf I have <Directory "/home/www/chris/www"> php_admin_value open_basedir /home/www/chris/www </Directory> This doesn't work. If anyone could let me know the proper format this is suppose to take, I'd be most appreciative. Thanks, Chris