diff --git a/language-ecmascript.cabal b/language-ecmascript.cabal
--- a/language-ecmascript.cabal
+++ b/language-ecmascript.cabal
@@ -1,5 +1,5 @@
 Name:           language-ecmascript
-Version:        0.12
+Version:        0.13
 Cabal-Version:	>= 1.10
 Copyright:      (c) 2007-2012 Brown University, (c) 2008-2010 Claudiu Saftoiu,
                 (c) 2012-2013 Stevens Institute of Technology
@@ -30,7 +30,7 @@
 Source-repository this
    type: git
    location: git://github.com/jswebtools/language-ecmascript.git
-   tag: 0.12
+   tag: 0.13
 
 Library
   Hs-Source-Dirs:
diff --git a/src/Language/ECMAScript3/PrettyPrint.hs b/src/Language/ECMAScript3/PrettyPrint.hs
--- a/src/Language/ECMAScript3/PrettyPrint.hs
+++ b/src/Language/ECMAScript3/PrettyPrint.hs
@@ -1,14 +1,51 @@
--- |Pretty-printing JavaScript.
+{-# LANGUAGE FlexibleInstances #-}
+
+-- | Pretty-printing JavaScript.
 module Language.ECMAScript3.PrettyPrint
   ( 
   javaScript
   , renderStatements
   , renderExpression
+  , PP (..)
   ) where
 
 import Text.PrettyPrint.HughesPJ
 import Language.ECMAScript3.Syntax
 import Prelude hiding (maybe)
+
+------------------------------------------------------------------------------
+
+class PP a where 
+  pp :: a -> Doc
+
+instance PP [Statement a] where 
+  pp = stmtList 
+
+instance PP (Expression a) where 
+  pp = ppExpression True
+
+instance PP (Statement a) where 
+  pp = ppStatement
+
+instance PP (ForInit a) where 
+  pp = forInit 
+
+instance PP (LValue a) where 
+  pp = ppLValue 
+
+instance PP InfixOp where 
+  pp = infixOp 
+
+instance PP AssignOp where 
+  pp = assignOp
+
+instance PP PrefixOp where 
+  pp = prefixOp
+
+
+----------------------------------------------------------------------------
+
+
 
 -- | Renders a list of statements as a 'String'
 renderStatements :: [Statement a] -> String