--- a/MPIWGRoot.py	Tue May 21 17:07:48 2013 +0200
+++ b/MPIWGRoot.py	Tue May 21 18:50:05 2013 +0200
@@ -137,7 +137,7 @@
     
         subsecs = sec.objectItems(spec=self.nav_meta_types)
         subsecs = [s for s in subsecs if s[1].title != ""]
-        subsecs.sort(key=lambda x:int(getattr(x[1],'weight','0')))
+        subsecs.sort(key=lambda x:getInt(getattr(x[1], 'weight', '0')))
         return subsecs
 
     # compatibility
@@ -147,7 +147,7 @@
     def getSections(self):
         """returns a list of all sections i.e. top-level MPIWGFolders"""
         items = self.objectValues(spec='MPIWGFolder')[:]
-        items.sort(key=lambda x:int(x.weight))
+        items.sort(key=lambda x:getInt(getattr(x, 'weight', '0')))
         return items