Please help! Slideshow Plugin image size

I am using the Slideshow WordPress plugin (formerly by Devpress), and I want to fill the slidehow with the entire image. I measured the size of the space that the image goes in and I made the images that size, but the slideshow is still showing white space at the bottom and on the right (it is like the image is always sitting at the top left corner of the slidehow “frame” even when I resized all the images to the exact inner size of the “frame”.

How can I fill the entire space?

I need to get this done really quick (like yesterday), please help!