[Zope] roles cannot be deleted in Mozilla

In ZMI when using Mozilla 0.9.6, user-defined roles are shown as empty squares at the bottom of the roles management page. User defined roles can be deleted "blindly" - if you remember the order in which they were created. This is probably caused by an extra slash that appears in option: <option value="myrole" /> ZMI works fine with MSIE 5.5 -- Milos Prudek