special characters rewrite?

i am into developing a swedish shop and i have the htaccess rules for rewriting the urls to html...now the problem is when i add ö ä å to the products the pages are not found...can someone give me a hand?thanks

 

It works fine when I test it with characters like ö and ä ... Can you paste your rewrite rulles?

 

sure thank for your reply..i've got oscommerce with seo urls and these are the htaccess rules

Options +FollowSymLinks
RewriteEngine On 
RewriteBase /

RewriteRule ^(.*)-p-(.*).html$ product_info.php?products_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-c-(.*).html$ index2.php?cPath=$2&%{QUERY_STRING}
RewriteRule ^(.*)-m-(.*).html$ index.php?manufacturers_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-pi-(.*).html$ popup_image.php?pID=$2&%{QUERY_STRING}
RewriteRule ^(.*)-t-(.*).html$ articles.php?tPath=$2&%{QUERY_STRING}
RewriteRule ^(.*)-a-(.*).html$ article_info.php?articles_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-pr-(.*).html$ product_reviews.php?products_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-pri-(.*).html$ product_reviews_info.php?products_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-i-(.*).html$ information.php?info_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-links-(.*).html$ links.php?lPath=$2&%{QUERY_STRING}

PHP: