[Zope] exUserFolder & form-based login

Please can someone tell me how to get exUserFolder to perform form-based login if a user attempts to access a protected resource? At present I can only get it to do a popup. I can do form-based login _explicitly_ with it (ie if user clicks on a "log in" link), but I need this implicit behaviour too. Any tips? Cheers, Andy -- Andy Gimblett - Programmer - Frontier Internet Services Limited Tel: 029 20 820 044 Fax: 029 20 820 035 http://www.frontier.net.uk/ Statements made are at all times subject to Frontier's Terms and Conditions of Business, which are available upon request.