[development] htaccess help

[Lynn Stott (Stott Design)]

I have a Drupal site installed at /bv, so home page is www.mysite.com/bv
I want to be sure when anyone tries www.mysite.com/anypage, they get  
redirected to www.mysite.com/bv/anypage
Is this possible via htaccess?
I currently have this rewrite to be sure the www is included (needed  
for SSL):
   RewriteCond %{HTTP_HOST} ^mysite\.com$ [NC]
   RewriteRule ^(.*)$ http://www. mysite.com/bv/$1 [L,R=301]

Thanks for any help.

Lynn