set max height in "image carousel"?

Hi,

I am using image carousel for displaying client logos.
How can I control the height of those logos? I have uploaded them as 100×200 size and I would like them to remain that size even if the page is getting bigger.

I love the way logos look on your demo page: http://blueowlcreative.com/wp/fortuna/image-carousels/
How do I do the same?

THANKS in advance!