#prevLink, #nextLink{ width: 49%; height: 100%; background-image: url(data:image/gif;base64,AAAA); /* Trick IE into showing hover */ display: block; }
#prevLink { left: 0; float: left;}
#nextLink { right: 0; float: right;}

#prevLink, #prevLink:visited { background: url(../../images/lightbox/prevlabel_swe.gif) left 100% no-repeat; }
#nextLink, #nextLink:visited { background: url(../../images/lightbox/nextlabel_swe.gif) right 100% no-repeat; }