Slideshow image size

Hello to all, Can anyone help with this?

I am having an issue with the slideshow on my site. Something is constraining the size of the images. The image is getting sized down and restricted. The image size should be about 1500 x 600.
Look at the page below. I have tried in-vain to fix it. And can not figure it out. HELP!!!!

http://www.johnpendleton.com/jpportfolio/new-homepage/

According to the Firefox dev tool there seems to be something inline constraining it.
/* Inline styles */
margin-left: auto;
margin-right: auto;
display: block;
width: 915px;
height: 310px;

Same with Google Chrome
element.style {
margin-left: auto;
margin-right: auto;
display: block;
width: 915px;
height: 310px;