Fixes bug 4650. Backed out some changes so that linux will start working again.

When bug 4668 is fixed I will put these back in.  Approved by chofmann and reviewed
by mscott.

mailnews/ui/messenger/resources/mailshell.xul

@@ -5,8 +5,6 @@
 
 <window xmlns:html="http://www.w3.org/TR/REC-html40"
 	xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-	onload="MsgStartUp()"
-	onconstruction="MsgStartUp()"
 	title="Messenger"
         style="width:100%;height:100%">
 

mailnews/ui/messenger/resources/threadPane.xul

@@ -26,7 +26,7 @@
   </treehead>
   
 
-  <treebody name="threadTreeBody">
+  <treebody id="mailbox://Inbox" name="threadTreeBody">
     <treeitem  open="true">
     </treeitem>
   </treebody>