Index: /trunk/roundcubemail/program/js/app.js
===================================================================
--- /trunk/roundcubemail/program/js/app.js	(revision 799)
+++ /trunk/roundcubemail/program/js/app.js	(revision 800)
@@ -2816,6 +2816,10 @@
 
       // get default/passive setting of the button
-      if (obj && button.type=='image' && !button.status)
+      if (obj && button.type=='image' && !button.status) {
         button.pas = obj._original_src ? obj._original_src : obj.src;
+        // respect PNG fix on IE browsers
+        if (obj.runtimeStyle && obj.runtimeStyle.filter && obj.runtimeStyle.filter.match(/src=['"]([^'"]+)['"]/))
+          button.pas = RegExp.$1;
+      }
       else if (obj && !button.status)
         button.pas = String(obj.className);