Remove mysterious embedded image from the prev/next navigation css.

- I'm guessing this was a hack for versions of IE prior to 8. Removing this line does not affect IE8 or 9.

css/lightbox.css

@@ -92,43 +92,42 @@
 .lb-prev, .lb-next {
   width: 49%;
   height: 100%;
-  background-image: url("data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7");
   cursor: pointer;
   /* Trick IE into showing hover */
   display: block;
 }
 
-/* line 73, ../sass/lightbox.sass */
+/* line 72, ../sass/lightbox.sass */
 .lb-prev {
   left: 0;
   float: left;
 }
 
-/* line 77, ../sass/lightbox.sass */
+/* line 76, ../sass/lightbox.sass */
 .lb-next {
   right: 0;
   float: right;
 }
 
-/* line 81, ../sass/lightbox.sass */
+/* line 80, ../sass/lightbox.sass */
 .lb-prev {
   background: url(../img/prev.png) left -48% no-repeat;
 }
-/* line 83, ../sass/lightbox.sass */
+/* line 82, ../sass/lightbox.sass */
 .lb-prev:hover {
   background-position: left 48%;
 }
 
-/* line 86, ../sass/lightbox.sass */
+/* line 85, ../sass/lightbox.sass */
 .lb-next {
   background: url(../img/next.png) right -48% no-repeat;
 }
-/* line 88, ../sass/lightbox.sass */
+/* line 87, ../sass/lightbox.sass */
 .lb-next:hover {
   background-position: right 48%;
 }
 
-/* line 91, ../sass/lightbox.sass */
+/* line 90, ../sass/lightbox.sass */
 .lb-dataContainer {
   margin: 0 auto;
   padding-top: 5px;
@@ -148,39 +147,39 @@
   clear: both;
 }
 
-/* line 98, ../sass/lightbox.sass */
+/* line 97, ../sass/lightbox.sass */
 .lb-data {
   padding: 0 10px;
   color: #bbbbbb;
 }
-/* line 101, ../sass/lightbox.sass */
+/* line 100, ../sass/lightbox.sass */
 .lb-data .lb-details {
   width: 85%;
   float: left;
   text-align: left;
   line-height: 1.1em;
 }
-/* line 106, ../sass/lightbox.sass */
+/* line 105, ../sass/lightbox.sass */
 .lb-data .lb-caption {
   font-size: 13px;
   font-weight: bold;
   line-height: 1em;
 }
-/* line 110, ../sass/lightbox.sass */
+/* line 109, ../sass/lightbox.sass */
 .lb-data .lb-number {
   display: block;
   clear: left;
   padding-bottom: 1em;
   font-size: 11px;
 }
-/* line 115, ../sass/lightbox.sass */
+/* line 114, ../sass/lightbox.sass */
 .lb-data .lb-close {
   width: 35px;
   float: right;
   padding-bottom: 0.7em;
   outline: none;
 }
-/* line 120, ../sass/lightbox.sass */
+/* line 119, ../sass/lightbox.sass */
 .lb-data .lb-close:hover {
   cursor: pointer;
 }

sass/lightbox.sass

@@ -65,7 +65,6 @@
 .lb-prev, .lb-next
   width: 49%
   height: 100%
-  background-image: url("data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7")
   cursor: pointer
   /* Trick IE into showing hover */
   display: block