.htaccess coding problem

[-=seth=-]

i rather stuck and was wondering if anybody could point me in the right direction

im trying to redirect some old pages to the new ones however because of the query string (i think) i'm getting stuck)

first i tried

Redirect 301 /index.php?act=viewCat&catId=75 http://www.grooming-health.com/proraso.htm
then

RewriteEngine on
RewriteRule ^act=viewCat&catId=75$ http://www.grooming-health.com/proraso.htm [R=301,L]

neither versions plus liberal use of \ work, could anybody advise me where i'm going wrong

thanks for your help