diff --git a/mail/base/content/mailWindow.js b/mail/base/content/mailWindow.js
index 2aa87cf275e5..6e40eb17b1aa 100644
--- a/mail/base/content/mailWindow.js
+++ b/mail/base/content/mailWindow.js
@@ -489,17 +489,22 @@ function ShowAccountCentral()
 {
     try
     {
-    var acctCentralPage = pref.getComplexValue("mailnews.account_central_page.url",
+        var acctCentralPage = pref.getComplexValue("mailnews.account_central_page.url",
                                                Components.interfaces.nsIPrefLocalizedString).data;
         GetMessagePane().collapsed = true;
         document.getElementById("threadpane-splitter").collapsed = true;
         gSearchBox.collapsed = true;
+        
         GetThreadTree().collapsed = true;
+        document.getElementById('messengerBox').setAttribute('flex', '1');
         document.getElementById("accountCentralBox").collapsed = false;
-    window.frames["accountCentralPane"].location = acctCentralPage;
+
+        window.frames["accountCentralPane"].location = acctCentralPage;
+        
         if (!IsFolderPaneCollapsed())
-            GetFolderTree().focus();
-    gAccountCentralLoaded = true;
+            GetFolderTree().focus();        
+
+        gAccountCentralLoaded = true;
     }
     catch (ex)
     {
@@ -519,9 +524,11 @@ function HideAccountCentral()
         document.getElementById("accountCentralBox").collapsed = true;
         GetThreadTree().collapsed = false;
         gSearchBox.collapsed = false;
+        
         var threadPaneSplitter = document.getElementById("threadpane-splitter");
         threadPaneSplitter.collapsed = false;
         GetMessagePane().collapsed = threadPaneSplitter.getAttribute("state") == "collapsed";
+        document.getElementById('messengerBox').removeAttribute('flex');
         gAccountCentralLoaded = false;
     }
     catch (ex)