diff --git a/pyscript/interfaces.py b/pyscript/interfaces.py
index 12c8932..87a9590 100644
--- a/pyscript/interfaces.py
+++ b/pyscript/interfaces.py
@@ -38,9 +38,15 @@ class IPythonScript(Interface):
     automatically.
     """
 
+    title = schema.TextLine(
+        title=_(u"Title"),
+        description=_(u"A descriptive title of the script."),
+        required=False,
+        default=u''
+    )
     parameters = schema.TextLine(
         title=_(u"Parameters"),
-        description=_(u"Space-separated list of parameter names."),
+        description=_(u"Comma-separated list of parameter names."),
         required=False,
         default=u''
     )
diff --git a/pyscript/rstat.py b/pyscript/rstat.py
index a5a2e42..5e2c599 100644
--- a/pyscript/rstat.py
+++ b/pyscript/rstat.py
@@ -31,6 +31,8 @@ from zope.traversing.browser import absoluteURL
 from cybertools.pyscript.plot import registerImage
 
 
+# not used (yet?):
+
 class RWrapper(object):
 
     def __init__(self, context):
@@ -45,27 +47,12 @@ class RWrapper(object):
         value = removeAllProxies(value)
         return RWrapper(value)
 
-
 rx = RWrapper(r)
 
 with_mode = RWrapper(rpy.with_mode)
 #as_py = RWrapper(rpy.as_py)
 
 
-def gdd(**kw):
-    r.library('GDD')
-    filename = os.tempnam(None, 'rplot')
-    robj = r.GDD(filename, type='jpg', **kw)
-    return filename + '.jpg', robj
-
-def graphics(**kw):
-    context = kw.pop('context', None)
-    request = kw.pop('request', None)
-    fn, robj = gdd(**kw)
-    key = registerImage(fn)
-    return '%s/@@plot?image=%s' % (absoluteURL(context, request), key)
-
-
 class RStat(object):
 
     def __init__(self, context, request):
diff --git a/pyscript/script.py b/pyscript/script.py
index 1ff5188..d85e80c 100644
--- a/pyscript/script.py
+++ b/pyscript/script.py
@@ -89,11 +89,16 @@ class PythonScript(Contained, Persistent):
 
     _v_compiled = None
 
+    title = u''
     parameters = u''
+    source = u''
+    contentType=u'text/plain'
 
-    def __init__(self, source=u'', parameters=u'', contentType=u'text/plain'):
+    def __init__(self, title=u'', parameters=u'', source=u'',
+                 contentType=u'text/plain'):
         """Initialize the object."""
         super(PythonScript, self).__init__()
+        self.title = title
         self.source = source
         self.contentType = contentType
         self.parameters = parameters or u''
@@ -164,12 +169,12 @@ class Function(object):
     """A compiled function.
     """
 
-    parameters = ''
+    parameters = []
 
     def __init__(self, source, parameters='', filename='<string>'):
         lines = []
         if parameters:
-            self.parameters = str(parameters).split()
+            self.parameters = [str(p).strip() for p in parameters.split(',')]
         #print '*** Function.parameters:', repr(self.parameters)
         lines.insert(0, 'def dummy(): \n    pass')
         for line in source.splitlines():
@@ -182,6 +187,7 @@ class Function(object):
     def __call__(self, args, globals):
         globals['__builtins__'] = SafeBuiltins
         for idx, p in enumerate(self.parameters):
+            # TODO: handle parameters with default values like ``attr=abc``
             globals[p] = args[idx]
         exec self.code in globals, None
 
@@ -198,12 +204,14 @@ class ScriptContainer(BTreeContainer):
 
     implements(IScriptContainer)
 
-    unrestricted_objects = ('rstat')  # not used (yet)
+    unrestricted_objects = ('rstat',)  # not used (yet)
+
+    def getItems(self):
+        return self.values()
 
     def updateGlobals(self, globs):
         if HAS_R:
             from cybertools.pyscript import rstat
-            #globs['rstat'] = rstat
             context = globs['context']
             request = globs['request']
             globs['rstat'] = rstat.RStat(context, request)