diff --git a/docgen/README.txt b/docgen/README.txt
index 8831bb3..19cf90e 100644
--- a/docgen/README.txt
+++ b/docgen/README.txt
@@ -26,15 +26,19 @@ Working with MHT Files
   >>> document = MHTFile(data)
   >>> document.addImage(imagePath)
 
-  >>> body = '''
+  >>> body = '''<img src="test_image.jpg" />
   ... '''
 
   >>> document.setBody(body)
 
+  >>> output = document.asString()
+  >>> len(data), len(output)
+  (294996, 295017)
+
   >>> outPath = os.path.join(basePath, 'out_doc.mht')
-  >>> f = open(outPath, 'wt')
-  >>> f.write(document.data)
-  >>> f.close()
+  >>> #f = open(outPath, 'wt')
+  >>> #f.write(document.asString())
+  >>> #f.close()
 
-  >>> os.unlink(outPath)
+  >>> #os.unlink(outPath)
 
diff --git a/docgen/mht.py b/docgen/mht.py
index 71fbb99..fe06424 100644
--- a/docgen/mht.py
+++ b/docgen/mht.py
@@ -20,14 +20,42 @@
 Working with MHT Files.
 """
 
+from email import message_from_string
+#from email.multipart import MIMEMultipart
+
+
 class MHTFile(object):
 
+    #encoding = 'UTF-8'
+    #encoding = 'ISO8859-15'
+    encoding = 'Windows-1252'
+    bodyMarker = 'lxdoc_body'
+    indexes = dict(body=2, filelist=-2)
+
+
     def __init__(self, data):
         self.data = data
+        self.msg = message_from_string(data)
+        self.boundary = self.msg.get_boundary()
+        self.parts = data.split(self.boundary)
+        #print '***', len(self.parts)
+        #for idx, part in enumerate(self.msg.walk()):
+        #    print '***', idx, part['Content-Location'], part.get_content_type()
 
     def addImage(self, imagePath):
         pass
 
     def setBody(self, body):
-        pass
+        content = body.encode(self.encoding)
+        bodyIndex = self.indexes['body']
+        baseDocument = self.parts[bodyIndex]
+        self.parts[bodyIndex] =  baseDocument.replace(self.bodyMarker, 
+                                        self.quopri(content))
+
+    def asString(self):
+        #msg = MIMEMultipart('related')
+        return self.boundary.join(self.parts)
+
+    def quopri(self, s):
+        return s.replace('="', '=3D"')