yes im using seo urls, my problem is that: for not to have duplicate content i have in htaccess this:
"RewriteCond %{THE_REQUEST} ^.*/index.php
RewriteRule ^(.*)index.php$ http://www.mysite.com/$1 [R=301,L]"
So i get bad urls when i choose a manufacturer from the manufacturers infobox, i get url like this one : http://www.mysite.com/?manufacturers_id=1.
THANKS TO HEPL ME........