Can't create a file/directories in Ubuntu 11.10 even if rights are set correctly

I'm affraid about something in ubuntu 11.10. I'm trying to give the write permission to the current user in a specific folder. So, at first, I'm cnanging the owner to give the propriety to my apache user on the default folder (/var/www). ``` sudo chown -R apache:apache /var/www ``` Then, I add my current use into the group apache. ``` sudo usermod -a -G apache ollie314 ``` I check that the ollie314 has the correct rights : ``` groups ollie314 > ollie314 apache ``` OK ! Now I check who am I. ``` whoami > ollie314 ``` Sounds good ... ``` cd /var/www mkdir test > mkdir: cannot create directory `test': Permission denied ``` hum ... I made something wrong, but I don't know where. I suspect a pass through parent forlder issue but it works fine on my debian squeeze. Somebody can help me ? Thanks in advance !