[Plugin: JJ NextGen JQuery Slider] thumbnails appearing over slideshow

Hi,

the thumbnails are appearing superimposed on top of the slideshow, any idea how to get them underneath the slideshow, not covering the picture?

thanks,

http://www.simonburtphotography.com/wedding-slideshow?show=gallery

http://ww.wp.xz.cn/extend/plugins/jj-nextgen-jquery-slider/