Please help redirecting a URL

[myartgallery]

Please help me redirecting a page using rewriting in htaccess. I searched all the internet to fix this problem...but could not find anything. This is my last hope. Please help me:

I'm trying to redirect the following php url for example:
http://www.mysite.com/index.php?id_produs=2760

to this html url:

http://www.mysite.com/index.php-id_produs-2760.html

...and I added [R=301] on this code but didn't works:
----------------------------------------------------------------------
RewriteEngine on
RewriteCond %{REQUEST_URI} ^index.php\?id_produs=([a-zA-Z0-9]*)$
RewriteRule index.php-id_produs-$1.html [R=301]
-----------------------------------------------------------------------

Where should I add [R=301]?

Thank you

[Izzmo]

Are you getting a 500 error?

Is Mod_Rewrite turned on? (Have to ask, since some hosts do not include this default functionality sometimes)