diff --git a/core/views_caves.py b/core/views_caves.py
index d8ced23..90b6f5e 100644
--- a/core/views_caves.py
+++ b/core/views_caves.py
@@ -21,14 +21,26 @@ def getCave(cave_id):
         cave = Cave.objects.get(unofficial_number=cave_id)
     return cave
 
+def pad5(x):
+   return "0" * (5 -len(x.group(0))) + x.group(0) 
+def padnumber(x):
+   return re.sub("\d+", pad5, x)
+def numericalcmp(x, y):
+   return cmp(padnumber(x), padnumber(y))
+
+
+
 def caveCmp(x, y):
     if x.kataster_number:
       if y.kataster_number:
-        return cmp(x.kataster_number, y.kataster_number)
+        return numericalcmp(x.kataster_number, y.kataster_number)
       else:
         return -1
     else:
-      return 1
+      if y.kataster_number:
+        return 1
+      else:        
+        return numericalcmp(x.unofficial_number, y.unofficial_number)
 
 def caveindex(request):
     caves = Cave.objects.all()