Catch possible "Permission denied" error on iframe elements in IE

skins/classic/functions.js

@@ -664,8 +664,13 @@ function rcmail_scroller(list, top, bottom)
 function iframe_events()
 {
   // this==iframe
-  var doc = this.contentDocument ? this.contentDocument : this.contentWindow ? this.contentWindow.document : null;
-  rcube_event.add_listener({ element: doc, object:rcmail_ui, method:'body_mouseup', event:'mouseup' });
+  try {
+    var doc = this.contentDocument ? this.contentDocument : this.contentWindow ? this.contentWindow.document : null;
+    rcube_event.add_listener({ element: doc, object:rcmail_ui, method:'body_mouseup', event:'mouseup' });
+  }
+  catch (e) {
+    // catch possible "Permission denied" error in IE
+  };
 };
 
 // Abbreviate mailbox names to fit width of the container

skins/larry/ui.js

@@ -251,8 +251,13 @@ function rcube_mail_ui()
 
     $('iframe').load(function(e){
       // this = iframe
-      var doc = this.contentDocument ? this.contentDocument : this.contentWindow ? this.contentWindow.document : null;
-      $(doc).mouseup(body_mouseup);
+      try {
+        var doc = this.contentDocument ? this.contentDocument : this.contentWindow ? this.contentWindow.document : null;
+        $(doc).mouseup(body_mouseup);
+      }
+      catch (e) {
+        // catch possible "Permission denied" error in IE
+      };
     })
     .contents().mouseup(body_mouseup);