persist window size and position

mailnews/base/resources/content/messenger.xul

@@ -38,8 +38,8 @@ Rights Reserved.
 		onload="OnLoadMessenger()"
 		onunload="OnUnloadMessenger()"
 		align="vertical"
-        width="800"
-        height="600"
+        width="640"
+        height="480"
         persist="width height x y"
 		windowtype="mail:3pane">
 

mailnews/base/resources/content/msgMail3PaneWindow.js

@@ -111,9 +111,30 @@ function OnUnloadMessenger()
 		if(mailSession)
 			mailSession.RemoveFolderListener(folderListener);
 	}
+
+    saveWindowPosition();
 	messenger.OnUnload();
 }
 
+function saveWindowPosition()
+{
+    // Get the current window position/size.
+    var x = window.screenX;
+    var y = window.screenY;
+    var h = window.outerHeight;
+    var w = window.outerWidth;
+
+    // Store these into the window attributes (for persistence).
+    var win = document.getElementById( "messengerWindow" );
+    win.setAttribute( "x", x );
+    win.setAttribute( "y", y );
+    win.setAttribute( "height", h );
+    win.setAttribute( "width", w );
+    // save x, y, width, height
+
+}
+
+
 function verifyAccounts() {
     try {
         var mail = Components.classes[mailSessionProgID].getService(Components.interfaces.nsIMsgMailSession);