More opacity options

css/app.css

@@ -1932,7 +1932,7 @@ img.wiki-image {
 .opacity-options {
     background: url(img/background-pattern-opacity.png) 0 0 repeat;
     height:20px;
-    width:62px;
+    width:82px;
     position: absolute;
     right: 10px;
     top: 10px;

js/id/ui/background.js

@@ -1,6 +1,6 @@
 iD.ui.Background = function(context) {
     var key = 'b',
-        opacities = [1, 0.5, 0],
+        opacities = [1, 0.75, 0.5, 0.25],
         directions = [
             ['left', [1, 0]],
             ['top', [0, -1]],