[Plugin: NextGEN Gallery] imagebrowser smaller images prolonged

Hi, there. I have nextgen gallery 1.9.3 in wordpress 3.3.1. I use imagebrowser on my page. When I import images into gallery I use scaling to 800 x 600 px. Normal images that have bigger width than height are displayed fine, but when there is an image that has bigger height than width, it is always prolonged because of nextgen want it to be wide exactly 800 px. So, you need to scroll down the page, usually quite a lot.. and there is also quality of the viewed image. You can see it’s only prolonged, it doesn’t look very nice.
Is it possible to change this behavior to view these “not normal” images in it’s narative scale, e.g. 400 x 600 px (not in 800 x 1200 px) ???
thanks a lot, every help and trying appreciated.

http://ww.wp.xz.cn/extend/plugins/nextgen-gallery/