Redirect https to http for certain pages.

I am modifying a drupal site, and I have a SSL certificate for the site. The problem i am having is that clients that view my site in IE are getting security pop ups for pages with videos on them. These pages do not hold any secure information on them so i would like them to be http instead of https, I only want certain pages with secure content in them to be https.

i.e
my home page https://www.drughelpdesk.com

and video blog

https://www.drughelpdesk.com/drug-counselor-video-blog

Is being displayed as https, and causing the annoying security alerts in IE7 and IE8, so i would like to change them to http, but keeping the rest of the site in https.

I have never changed a .htaccess file before, and somebody added this for me when i set the site up originally. How would i change this to make the changes i am sugessting?

Code:

---

# uncomment the following line:
  # RewriteBase /

  # Rewrite URLs of the form 'x' to the form 'index.php?q=x'.
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_URI} !=/favicon.ico
  RewriteRule ^(.*)$ index.php?q=$1 [L,QSA] 

RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.drughelpdesk.com/$1 [R,L]
 
</IfModule>

# $Id: .htaccess,v 1.90.2.5 2010/02/02 07:25:22 dries Exp $

# for flash video module
php_value  post_max_size  200M
php_value  upload_max_filesize  200M
php_value  max_execution_time  1000
php_value  max_input_time  1000

---

Thanks.