htaccess help please

[fgatlin]

The .htaccess file was accidently deleted from the server. Service provider claims there are no backups.
Here is my problem. I need an htaccess file that will turn:
xxxxx.com/?action=view&cat=10391
into
xxxxx.com/Ship-Ready_Boxes/inv/10391
Any suggestions are greatly appreciated!!

[johnj]

Try this:

RewriteRule ^?action=view&cat=10391$ /?action=view&cat=10391/ [R]
RewriteRule ^?action=view&cat=10391/$ /Ship-Ready_Boxes/inv/10391