CMS Problem with 301 redirect for CMS page
 

I am removing one of my CMS pages and want a 301 redirect for that page, as the content is now on a static html page on a different site.. However this doesn't seem to work

In my .htaccess file I have:

Code:
Redirect 301 /content.php?121-Oldpage http://www.mydomain.com/newpage.html
Can anyone tell me why this is not redirecting please?