diff --git a/ChangeLog b/ChangeLog
index 6e9bf3eba..2caa260e4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-03-08  Francis Lachapelle  <flachapelle@inverse.ca>
+
+	* UI/WebServerResources/generic.js (getTopWindow): extend the
+	attributes of document.body before calling "hasClassName" to fix
+	an error with IE9.
+
 2012-03-06  Wolfgang Sourdeau  <wsourdeau@inverse.ca>
 
 	* SoObjects/Mailer/SOGoMailFolder.m
diff --git a/UI/WebServerResources/generic.js b/UI/WebServerResources/generic.js
index c59bf0b1c..1d0f6acbd 100644
--- a/UI/WebServerResources/generic.js
+++ b/UI/WebServerResources/generic.js
@@ -1494,7 +1494,7 @@ function getTopWindow() {
     var topWindow = null;
     var currentWindow = window;
     while (!topWindow) {
-        if (currentWindow.document.body.hasClassName("popup")
+        if ($(currentWindow.document.body).hasClassName("popup")
             && currentWindow.opener
             && currentWindow.opener.getTopWindow)
             currentWindow = currentWindow.opener;