apache; permission denied

Hi there !

I want to make httpd create certain directory in the user's public_html
directory. I put 'mkdir' in some php file and httpd is initiated by the
same user. When I request access to this php file by web browser, httpd
leaves 'permission denied ...' in the error log file. Did I miss something?
The parent directory of the target directory is set to 777 and
httpd_sys_content_t.

OS: Fedora 3 (SELinux)
httpd: apache (2.0.52)

Thanks.