De-activating the image link in the NextGen gallery

I need help! ?? I’m using the NextGen gallery. The problem is that I’m using the gallery in a quite untraditional way.

All my thumbs is 700 px wide, why I don’t want them to open in Thickbox, Lightbox or another window – they are big enough for me just in the list.

Basically I want to de-activate the img url and I don’t see this is a possibility in the admin module.