'Timeline express' resizing images badly

http://www.freshfields.org.uk/timeline/

Hi,

Pls help or at least give me a clue as to why the plugin Timeline Express is resizing the images I use in it so badly. It keeps cutting them to a letter box shape that just isn't deep enough. Pls there must be some code somewhere in its code that is telling it to do this?

Pls help as my client is insisting I can make them deeper and i have no idea how to do it?

I have allowed access plus screen grab as to how i would like the depth to be attached.

Many thanks