#prevLink, #prevLink:hover, #prevLink:visited:hover {
  background: url(../images/lightbox/prevlabel.gif) no-repeat left 0 top 0 !important;
}

#nextLink, #nextLink:hover, #nextLink:visited:hover {
  background: url(../images/lightbox/nextlabel.gif) no-repeat right 0 top 0 !important;
}