Can't increase the number of columns in Image Show

please, look at this page:
http://lnx.coldplayzone.it/index.php?op ... 8&lang=it#

I can't increase the number of columns

In module parameters I set: thumbs_cols=5;
but I always have 3 columns

I tried other numbers like: 2, 4, 10
but nothing changed

Thanks for your help

Solved. I've added image_cols to my parameters and it works now.