Mod_rewrite help

I’m working on a site where the URL vars have shifted because they migrated their database. For example “” changed to “”. These will be eliminated over tima as the id’s are always incrimenting and they remove the old ones so i want to setup a mod_rewrite. However mod_rewrite hates me and will not cooperate. I have tried:

RewriteEngine on 
RewriteRule ^/search_details?tourid=ETTD000001$ /search_details?tourid=ETWT00000001 [R,NC,L]

and putting that in a “.htaccess” in the pages folder. doesn’t even try.

Any ideas?