[Zope] Problem with passing <input type=hidden value='<dtml-var nbMenu>' name=nbMenu> from an external Method

Hi all, Source code of SaveMenu.html <dtml-var "SaveMenu(REQUEST=REQUEST)"> Source code of the external method SaveMenu def SaveMenu(self, REQUEST=None): s="" i = 1 s = s +"<input type=hidden value='<dtml-var nbMenu>' name=nbMenu>" return s And here is the code returned when SaveMenu is executed: <input type=hidden value='<dtml-var nbMenu>' name=nbMenu> instead of value='<dtml-var nbMenu>' I should have value=(an integer) Is there an alternative solution to fix that problem? Many Thanks, Yannick