Use relative imports (fixes #26)
diff --git a/idna/codec.py b/idna/codec.py
index cdd9675..98c65ea 100644
--- a/idna/codec.py
+++ b/idna/codec.py
@@ -1,4 +1,4 @@
-from idna.core import encode, decode, alabel, ulabel, IDNAError
+from .core import encode, decode, alabel, ulabel, IDNAError
 import codecs
 import re
 
diff --git a/idna/compat.py b/idna/compat.py
index ef9bcbd..4d47f33 100644
--- a/idna/compat.py
+++ b/idna/compat.py
@@ -1,5 +1,5 @@
-from idna.core import *
-from idna.codec import *
+from .core import *
+from .codec import *
 
 def ToASCII(label):
     return encode(label)