How do I turn off relative positioning?

http://mikroautobusunuoma.org/

The positioning of the slider on the page is screwed up in all 3 major browsers. By turning off ‘position:relative’ (Element style) It seems to fix the issue (In Firebug, etc.) I have searched every file on the server and cannot find where the element style is though. I used Agent Ransack to search multiple terms to try to find the line of code, to no avail.

I am lost as where to go from here.

This is a wordpress site with a built-in-theme Jquery Slider.

    <div id="featured-slider" style="background-image: none; position: relative; overflow: hidden;">

    element.style {
       background-image: none;
       overflow: hidden;
       position: relative;
    }