[Zope] dynamic form checkbox data

Hi, I have a form which has (dynamically-generated) checkboxes (from database rows). these are of the form: <input type=checkbox name="ismember:list:string" checked><dtml-var sequence-var-name> (some do not default to checked). When I'm processing the form data, the list contains data for only those that are checked (i.e. no list if none are checked, a short list if some are checked). How can I generate a list of boolean values representing the user's selections? I need to use the boolean value in a dtml-if in the sql that processes the form data. Any help would be greatly appreciated, thanks, Rua HM. http://mobile.yahoo.com.au - Yahoo! Mobile - Check & compose your email via SMS on your Telstra or Vodafone mobile.