load the messenger start page from the onload handler rather than the src= attribute of the iframe

mailnews/base/resources/content/messagePane.xul

@@ -18,7 +18,7 @@ window {
 </html:style>
 <box align="vertical" style="width: 100%; height: 100%">
 <box align="horizontal" flex="100%">
-<html:iframe src="http://www.mozilla.org/mailnews/prefs-info.html" name="browser.webwindow" width="100%" height="325px" flex="100%"> </html:iframe>
+<html:iframe name="browser.webwindow" width="100%" height="325px" flex="100%"> </html:iframe>
 </box>
 </box>
 </window>

mailnews/base/resources/content/messenger.xul

@@ -236,8 +236,8 @@
 <window xmlns:html="http://www.w3.org/TR/REC-html40"
 	xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
 	title="&messengerWindow.title;"
-	onload="OnLoad()"
-	onunload="OnUnload()"
+	onload="OnLoadMessenger()"
+	onunload="OnUnloadMessenger()"
     style="width:100%;height:100%">
 
 <html:script src="chrome://messenger/content/widgetglue.js"/>
@@ -535,7 +535,7 @@
     </toolbox>
 
     <!-- The main mail three pane frame -->
-    <html:iframe src="chrome://messenger/content/3panemail.html" name="browser.3panemail" flex="100%" />
+    <html:iframe src="chrome://messenger/content/3panemail.html" name="browser.3panemail" flex="100%" id="messengerContent"/>
 
     <!-- Ripped off from navigator.xul; this should be a XUL fragment! -->
     <box align="horizontal" id="status-bar">