Mod rewrite question

I have url's like this

http://localhost/myproject/show.php?category=travel1&member=derek&ID=3

Code (markup):

I can rewrite to directory style, like this

http://localhost/myproject/travel/derek/3

Code (markup):

But I want to short url's like this Is

Category + member

http://localhost/myproject/travel/derek

Code (markup):

or very short one

just member

http://localhost/myproject/derek

Code (markup):

is this possible?

 

also subdomain redirection , will ok

like this
http://derek.domain.com

Any ideas

 

Options +FollowSymlinks
RewriteEngine on
RewriteRule ^(.*)/(.*)/ show.php?category=$1&member=$2&ID=3 [L]


put .htaccess in the myproject directory

 

ok thank you