so far this is what I have, it does not work
http://example.com/member.php?username=aaaa
http://www.example.com/aaaa or http://site.com/aaaa
will be redirected to or equivalent to :
http://example.com/member.php?username=aaaa
rewriteEngine on
Options +FollowSymlinks
rewriteCond %{REQUEST_FILENAME} !-d
rewriteRule ^([^/]+)$ /member.php?username=$1 [L]
Thanks in advance