diff --git a/CHANGES.txt b/CHANGES.txt
index 56bdf5f..6dd2f84 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -4,6 +4,7 @@ Changelog
 1.0b3 - unreleased
 ------------------
 
+* Plone 4+ imports (removes warnings under Plone 4.1)
 
 1.0b2 - 2010-09-02
 ------------------
@@ -15,22 +16,22 @@ Changelog
 * Move to plone.app.discussion-captcha feature declaration to meta.zcml.
   [timo]
 
-* Fix verify method for empty string input values. This is necessary for 
+* Fix verify method for empty string input values. This is necessary for
   plone.app.discussion 1.0b5 compatibility.
-  [timo] 
+  [timo]
 
 1.0b1 - 2010-06-02
 ------------------
 
-* Fix _generate_words method. The "nowish" variable tells us in which 5 minutes 
-  slot we are in. Therefore we increment the time slot by 1, not by 5 (minutes).  
+* Fix _generate_words method. The "nowish" variable tells us in which 5 minutes
+  slot we are in. Therefore we increment the time slot by 1, not by 5 (minutes).
   [tbesluau]
 
-* Declare that plone.formwidget.captcha provides a Captcha field that can be 
+* Declare that plone.formwidget.captcha provides a Captcha field that can be
   used by plone.app.discussion to add a Captcha field to comment forms.
   [timo]
 
-         
+
 1.0a2 - 2010-01-28
 ------------------
 
diff --git a/plone/formwidget/captcha/browser/captcha.py b/plone/formwidget/captcha/browser/captcha.py
index b41020c..387a3ee 100644
--- a/plone/formwidget/captcha/browser/captcha.py
+++ b/plone/formwidget/captcha/browser/captcha.py
@@ -2,7 +2,7 @@
 import os.path
 import random
 import re
-import sha
+
 import string
 import sys
 import time
@@ -13,7 +13,12 @@ from zope.interface import implements
 from zope.component import getUtility
 from Acquisition import aq_inner
 from App.config import getConfiguration
-from Globals import package_home
+try:
+    # Plone 4+
+    from App.Common import package_home
+except:
+    from Globals import package_home
+
 from Products.Five import BrowserView
 from plone.keyring.interfaces import IKeyManager
 
@@ -33,10 +38,10 @@ _TEST_TIME = None
 
 class Captcha(BrowserView):
     implements(ICaptchaView)
-    
+
     _session_id = None
     __name__ = 'captcha'
-    
+
     def _setcookie(self, id):
         """Set the session cookie"""
         resp = self.request.response
@@ -64,24 +69,24 @@ class Captcha(BrowserView):
                 self._setcookie(self._session_id)
             # Put the cookie value into the request for immediate consumption
             self.request.cookies[COOKIE_ID] = self._session_id
-    
+
     def _generate_words(self):
         """Create words for the current session
-        
+
         We generate one for the current 5 minutes, plus one for the previous
         5. This way captcha sessions have a livespan of 10 minutes at most.
-        
+
         """
         session = self.request[COOKIE_ID]
         nowish = _TEST_TIME or int(time.time() / 300)
-        # The line above defines nowish, which tells us what five minutes slot 
+        # The line above defines nowish, which tells us what five minutes slot
         # we're in. Indeed, every second, int(time.time()) increments by 1, so
         # int(time.time() / 300) will increment by 1 every 5 minutes.
         secret = getUtility(IKeyManager).secret()
         seeds = [sha.new(secret + session + str(nowish)).digest(),
                  sha.new(secret + session + str(nowish - 1)).digest()]
         # The line above generates a seed based on the "nowish" of 5 minutes ago.
-        
+
         words = []
         for seed in seeds:
             word = []
@@ -90,19 +95,19 @@ class Captcha(BrowserView):
                 word.append(CHARS[index])
             words.append(''.join(word))
         return words
-    
+
     def _url(self, type):
         return '%s/@@%s/%s' % (
             aq_inner(self.context).absolute_url(), self.__name__, type)
-    
+
     def image_tag(self):
         self._generate_session()
         return '<img src="%s" />' % (self._url('image'),)
-    
+
     def audio_url(self):
         self._generate_session()
         return self._url('audio')
-        
+
     def verify(self, input):
         if not input:
             return False
@@ -114,11 +119,11 @@ class Captcha(BrowserView):
             self.request.response.expireCookie(COOKIE_ID, path='/')
         except KeyError:
             pass # No cookie
-        
+
         return result
-        
+
     # Binary data subpages
-    
+
     def _setheaders(self, type):
         resp = self.request.response
         resp.setHeader('content-type', type)
@@ -126,14 +131,14 @@ class Captcha(BrowserView):
         resp.setHeader('cache-control', 'no-cache, no-store')
         resp.setHeader('pragma', 'no-cache')
         resp.setHeader('expires', 'now')
-        
+
     def image(self):
         """Generate a captcha image"""
         self._verify_session()
         self._setheaders('image/png')
         return skimpyAPI.Png(self._generate_words()[0],
                              fontpath=VERAMONO).data()
-    
+
     def audio(self):
         """Generate a captcha audio file"""
         self._verify_session()