Make the js-hidden class work properly in IE.

IE doesn't remove dom nodes when they're display: none, but can't handle visibility well it seems. So use display instead.

htdocs/theme/default/static/style/js.css

@@ -9,6 +9,8 @@
     position: absolute;
     visibility: hidden;
     top: 0;
+    *display: none;
+    *visibility: visible;
 }
 .nojs-hidden-inline {
     display: inline;