Slider Resizing image

I’m trying to prevent the Responsive Slider from scaling up my images. It seems to be scaling at 110% – 120% percent. How can I adjust the plugin so that the slider images load at their original size?

http://www.iamthelab.com

You can see how it’s supposed to look here http://www.labmaison.com

http://ww.wp.xz.cn/extend/plugins/responsive-slider/