--- a/app/soc/logic/cleaning.py	Fri Mar 20 21:16:15 2009 +0000
+++ b/app/soc/logic/cleaning.py	Fri Mar 20 21:27:14 2009 +0000
@@ -280,10 +280,12 @@
 def clean_ascii_only(field_name):
   """Clean method for cleaning a field that may only contain ASCII-characters.
   """
+
   @check_field_is_empty(field_name)
   def wrapper(self):
     """Decorator wrapper method.
     """
+
     value = self.cleaned_data.get(field_name)
 
     try:
@@ -297,6 +299,24 @@
   return wrapper
 
 
+def clean_numeric_only(field_name):
+  """Clean method for cleaning a field that may only contain numerical values.
+  """
+
+  @check_field_is_empty(field_name)
+  def wrapper(self):
+    """Decorator wrapped method.
+    """
+
+    value = self.cleaned_data.get(field_name)
+
+    if not value.isdigit():
+      raise forms.ValidationError("Only numerical characters are allowed")
+
+    return value
+  return wrapper
+
+
 def clean_feed_url(self):
   """Clean method for cleaning feed url.
   """