301 Redirect

Gallery version = 2.2.4 core 1.2.0.6
PHP version = 5.2.5 cgi
Webserver = Apache/2.2.8 (Unix) mod_ssl/2.2.8 OpenSSL/0.9.7a mod_bwlimited/1.4
Database = mysqlt 4.1.22-standard, lock.system=flock
Toolkits = Exif, Gd
Acceleration = none, none
Operating system = Linux gamma.ausweb.com.au 2.6.9-67.0.7.ELsmp #1 SMP Sat Mar 15 06:33:45 EDT 2008 x86_64
Default theme = matrix
gettext = enabled
Locale = en_US
Browser = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
Rows in GalleryAccessMap table = 15
Rows in GalleryAccessSubscriberMap table = 131
Rows in GalleryUser table = 2
Rows in GalleryItem table = 131
Rows in GalleryAlbumItem table = 7
Rows in GalleryCacheMap table = 0

I am have a bit of trouble trying to create a few 301 redirects (url rewrite is on) and have been trying most ideas from .htaccess google search all to no avail.

I have this URL which is returning a 404:

http://www.darlingriverrun.com.au/stock/v/Mungo_NP/walls/_5212750.jpg...

and I want it to redirect to

http://www.darlingriverrun.com.au/stock/v/Mungo_NP/The_Walls/_5212750...

So I am using:
redirect 301 /stock/v/Mungo_NP/walls/_5212750.jpg.html
http://www.darlingriverrun.com.au/stock/v/Mungo_NP/The_Walls/_5212750...

But it is adding to the path:
?g2_path=Mungo_NP/walls/_5212750.jpg.html

Is there a way to correctly do a 301 in this situation?

Regards

Sambob