I am developing a website www.anupamsengupta.in
i want to use url rewriting on that website, tried this code but the url is not changing

Code:
Options +FollowSymLinks
RewriteEngine on
RewriteRule -op-(.*)-pg-(.*)\.html blog.php?op=$1&pg=$2
....plzzz help me with this

Regards,
Havock Web Designers