How can I write 
http://www.mydomain.com/c/portal/layout?p_l_id=PUB.1013.*
to 
http://www.mydomain.com/c/portal/layout/p_l_id=PUB.1013.*
using this:

<VirtualHost *:80>
    ServerAdmin whatever@whatever.com
    RewriteEngine on
    RewriteCond %{REQUEST_URI} ^/c/portal/layout [NC]
    RewriteCond %{QUERY_STRING} p_l_id=PUB\.1013 [NC]
    RewriteRule ^ - [F]
</VirtualHost>