jquery plugin - trying to change an elements width/background

jquery plugin - trying to change an elements width/background

I'm using a jquery plugin to create an image slider with thumbnails underneath.
My goal is to have the main image's background be `bg.png`, with the thumbnail section background be `wood.png`.

I've changed the CSS to what I believe to be correct(see below), but the background of the thumbnail section isn't extending the full `961px`, it's restricted to the `921px` width I've established with the main image. I have a feeling this might be due to nesting within the plugin's php/jquery, I'm just not sure how to go about altering it to work. If that is the case, how do I fix it? If it's something else, how do I determine what it is/how to fix it?

Really and truly, insight, tips, ideas, a point in the right direction, etc are greatly appreciated.

ETA: I can't help but notice all of the views and no answer; what can I do to facilitate an answer or guidance? Am I missing information? If so, let me know and I'll do my best to provide it.

CSS
  1. .thethe_image_slider.white-square-1{
        background: url('../images/bg.png');
    }
    .white-square-1 .thethe-image-slider-thumbnails{
        background: url('../images/wood.png');
        margin-top: 20px;
        margin-bottom: 40px;
    }









thethe-image-slider.php : http://pastebin.com/QJD49Qhn
timthumb.php : http://pastebin.com/b4M9VGWd
Live site : http://urbanpalate.com/instyle-mag-ming-by-mango/