black background in IE7

Hi All,

In IE7, the background color of my main images/content is black and I can't find a way to change this. I can't find a way to override this with css. I tried:

  #views_slideshow_thumbnailhover_main_1
  {
    background-color: transparent;
  }
  #views_slideshow_thumbnailhover_teaser_section_1
  {
    background-color: transparent;
  }
  #views_slideshow_thumbnailhover_div_1_0
  {
    background-color: transparent;
  }

tnx in advance.
Cheers,
Danny