htaccess url rewrite

Okay, I want to put together a rewrite code in my htacess file that will allow me to do something like this:

21,Savior,62,30,IMF,Dalian.png

instead of

testsig.png?style=21&username=Savior&level=62&np=30&clan=IMF&server=Dalian

My htaccess file already forces testsig.png to be render as php.

Options +FollowSymLinks

RewriteEngine On

RewriteRule ^([0-9]+),([a-z]+),([0-9]+),([0-9]+),([a-z]+),([a-z]+)\.png$ testsig.png?style=$1&username=$2&level=$3&np=$4&clan=$5&server=$6 [NC,L]