Without comprimizeing the security I want a user to have write access to the content folder for apache. However I cannot achive this, and need assistance. I want my user account to have write permisions to /var/www/html

I decided to create a webaster group, make the user a member of the new group then change ownership of /var/www/html:
Code:
/usr/sbin/groupadd webmaster
gedit /etc/group
# webmaster:x:502:root,atapi103
chown -R :webmaster html
chmod -R 775 html
However I am unable to write to that folder.

atapi103 [/var/www]$ ls -l
total 20
drwxr-xr-x 2 root root 4096 Nov 19 08:40 cgi-bin
drwxr-xr-x 3 root root 4096 Apr 3 04:32 error
drwxrwxr-x 3 root webmaster 4096 Nov 19 08:40 html
drwxr-xr-x 3 root root 4096 Apr 3 04:33 icons
drwxr-xr-x 14 root root 4096 Apr 3 04:39 manual

atapi103 [/var/www/html]$ gedit index.htm
Cannot create the file "/var/www/html/index.htm".
Make sure you have the appropriate write permissions.
atapi103 should have write access to html correct? How can I alow atapi103 to have write access, without comprimizeing the security as to allow other unauthorized users access?