Number of pictures columns in the gallery

[jdimaging]

I am trying to adjust the number of columns in the thumbnail gallery. Right now it is at 4 and as I am calling the forum through an iframe I would like to adjust it to 3 columns at
www.runningtrades.com/forum. The link out of the iframe is
http://www.runningtrades.com/forum/index.php?action=gallery;cat=1
I found the below but tried to do this in the database but no luck.

There is a setting that can be set.
Insert the following entry via the database in the smf_settings table
Insert for the variable
gallery_set_images_per_row
With value of
3

Any suggestion would be greatly appreciated as it really doesn't look nice as is.

[SMFHacks]

That setting isn't present in SMF Gallery Lite currently only a feature of SMF Gallery Pro might roll out in the next update of lite if needed