diff --git a/weboob/tools/value.py b/weboob/tools/value.py
new file mode 100644
index 00000000..6e5659c6
--- /dev/null
+++ b/weboob/tools/value.py
@@ -0,0 +1,103 @@
+# -*- coding: utf-8 -*-
+
+# Copyright(C) 2010  Romain Bignon
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, version 3 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+import re
+from .ordereddict import OrderedDict
+
+
+__all__ = ['ValuesDict', 'Value', 'ValueInt', 'ValueBool', 'ValueFloat']
+
+
+class ValuesDict(OrderedDict):
+    def __init__(self, *values):
+        OrderedDict.__init__(self)
+        for v in values:
+            self[v.id] = v
+
+class Value(object):
+    def __init__(self, *args, **kwargs):
+        if len(args) > 0:
+            self.id = args[0]
+        else:
+            self.id = ''
+        self.label = kwargs.get('label', kwargs.get('description', None))
+        self.description = kwargs.get('description', kwargs.get('label', None))
+        self.default = kwargs.get('default', None)
+        self.regexp = kwargs.get('regexp', None)
+        self.choices = kwargs.get('choices', None)
+        if isinstance(self.choices, (list,tuple)):
+            self.choices = dict(((v, v) for v in self.choices))
+        self.masked = kwargs.get('masked', False)
+        self.required = kwargs.get('required', self.default is None)
+        self._value = kwargs.get('value', None)
+
+    def check_valid(self, v):
+        if v == '' and self.default != '':
+            raise ValueError('Value can\'t be empty')
+        if self.regexp is not None and not re.match(self.regexp, unicode(v)):
+            raise ValueError('Value "%s" does not match regexp "%s"' % (v, self.regexp))
+        if self.choices is not None and not v in self.choices.iterkeys():
+            raise ValueError('Value "%s" is not in list: %s' % (v, ', '.join([unicode(s) for s in self.choices.iterkeys()])))
+
+    def set_value(self, v):
+        self.check_valid(v)
+        self._value = v
+
+    @property
+    def value(self):
+        return self._value
+
+class ValueInt(Value):
+    def __init__(self, *args, **kwargs):
+        kwargs['regexp'] = '^\d+$'
+        Value.__init__(self, *args, **kwargs)
+
+    @property
+    def value(self):
+        return int(self._value)
+
+class ValueFloat(Value):
+    def __init__(self, *args, **kwargs):
+        kwargs['regexp'] = '^[\d\.]+$'
+        Value.__init__(self, *args, **kwargs)
+
+    def check_valid(self, v):
+        try:
+            float(v)
+        except ValueError:
+            raise ValueError('Value "%s" is not a float value')
+
+    @property
+    def value(self):
+        return float(self._value)
+
+class ValueBool(Value):
+    def __init__(self, *args, **kwargs):
+        kwargs['choices'] = {'y': 'True', 'n': 'False'}
+        Value.__init__(self, *args, **kwargs)
+
+    def check_valid(self, v):
+        if not isinstance(v, bool) and \
+           not unicode(v).lower() in ('y', 'yes', '1', 'true',  'on',
+                                      'n', 'no',  '0', 'false', 'off'):
+            raise ValueError('Value "%s" is not a boolean (y/n)' % v)
+
+    @property
+    def value(self):
+        return (isinstance(self._value, bool) and self._value) or \
+                unicode(self._value).lower() in ('y', 'yes', '1', 'true', 'on')