CodingForums.com - url construction

Hi, I have urls that look like 'mysite.com/48YSWD96', however I need to be able to write them as urls that look like 'mysite.com/?d=48YSWD96' and still have them go to the same place. My .htaccess code looks like this:

Code:

RewriteEngine on

RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_FILENAME}\.php -f

RewriteRule ^([^/]+)/$ $1.php

RewriteRule ^([^/]+)/([^/]+)/$ /$1/$2.php



RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/)$

RewriteRule (.*)$ /$1/ [R=301,L]

RewriteBase /

I hope that was clear. What do I need to add? any help is much appreciated, thanks.