Thanks a lot. Works great!

Hi. I tried to use this in my child-theme function.php for the small portfolio images:

add_action('init', 'ava_my_image_size', 1);
function ava_my_image_size()
{ 
global $avia_config;
$avia_config['imgSize']['portfolio_small'] 		= array('width'=>260, 'height'=>185, array(top, center));						// images for portfolio 4 columns
}

and after that I used http://wordpress.org/plugins/regenerate-thumbnails/ for the wanted images, but it stayed the same?!
Any ideas?

thanks