diff --git a/nivo-slider.css b/nivo-slider.css
index d806fef..e88a352 100644
--- a/nivo-slider.css
+++ b/nivo-slider.css
@@ -72,7 +72,7 @@
 	overflow: hidden;
 	display: none;
 	-moz-opacity: 0.8;
-	filter:alpha(opacity=8);
+	filter:alpha(opacity=80);
 	-webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
 	-moz-box-sizing: border-box;    /* Firefox, other Gecko */
 	box-sizing: border-box;         /* Opera/IE 8+ */