.htaccess Url Rewrite - Syntax

Hi,

I am trying to set up my site to have nicely formatted URLs. I am trying to get a rewrite rule to transfer:

http://micasa.ie/BiancaBed-134/BiancaRange-rn/43.htm

to

http://micasa.ie/prodView.php?id=134&frm=rn&refId=43

I am using the following .htaccess file:



There are no problems with permissions and stuff because I have gotten simpler versions of this to work. Can anybody see what Im doing wrong?

I get a page not found error when I use my formatted URL.

Thanks:

Beedge