Phpmyadmin

I’ve sucessfully installed freePBX 2.4.0 and phpMyAdmin on CentOS5.
But, when I tried to launch phpMyAdmin, will always get the following error:

“You have no permission to access /var/www/html/admin/modules/phpmyadmin/index.php on this server”

I’ve changed the file permission using : chmod 775 /var/www/html/admin/modules/phpmyadmin/index.php, but still didn’t work.

Any help, please!