mod_rewrite on subdirectory help

[JoeAtRevolutionUnltd]

I am trying to set up an htaccess file on my testing server to take my urls as:

http://localhost/sub/directory/index.php?p1=1&p2=3&p3=3

and write them as:

http://localhost/sub/directory/1/2/3

Going to

http://localhost/sub/directory/index.php

gets rewritten fine,

http://localhost/sub/directory/.

But any subpages

http://localhost/sub/directory/index.php?p1=1,

go to

http://localhost/.

Can anyone help me out?

Here is the code I am using.

RewriteEngine on

RewriteCond %{REQUEST_FILENAME}  !-d
RewriteCond %{REQUEST_FILENAME}  !-f
RewriteRule ^([0-9a-zA-Z-]+)/?([0-9a-zA-Z-]+)?/?([0-9a-zA-Z-]+)?/?([0-9a-zA-Z-]+)?/?([0-9a-zA-Z-]+)?/?$ index.php?s1=$1&s2=$2&s3=$3&s4=$4&s5=$5 [QSA,L]