Change existing keyword delimiter from a semicolon to comma or remove alltogether

I am looking for some help in replacing or deleting all my *current* keyword delimiters. Currently they are a semicolon and I need them to be a comma or delete them and just use a space.

I am thinking this will have to be some sort of database update query, but don't know the sql syntax for that nor do I know the tables and fields needed.

Any help would be greatly appreciated.

Thanks, Michael

MY SYSTEM INFO:
Gallery version = 2.2.4 core 1.2.0.6
PHP version = 5.2.4-2ubuntu5.26 apache2handler
Webserver = Apache/2.2.8 (Ubuntu) PHP/5.2.4-2ubuntu5.26 with Suhosin-Patch
Database = mysqli 5.0.96-0ubuntu3, lock.system=flock
Toolkits = ArchiveUpload, Dcraw, Exif, Getid3, ImageMagick, LinkItemToolkit, Thumbnail, SquareThumb
Acceleration = none, none
Operating system = Linux mistux-desktop 2.6.24-32-generic #1 SMP Mon Dec 3 15:48:29 UTC 2012 i686
Default theme = matrix
gettext = enabled
Locale = en_US
Browser = Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Rows in GalleryAccessMap table = 37
Rows in GalleryAccessSubscriberMap table = 39503
Rows in GalleryUser table = 7
Rows in GalleryItem table = 39501
Rows in GalleryAlbumItem table = 759
Rows in GalleryCacheMap table = 0