[Zope] Passing vars in a REDIRECT

All, At the end of some processing I want to redirect the user to another page using the value of an id field: If I hard code the emp_id in it works. <dtml-call "RESPONSE.redirect('view_by_id?emp_id=1741')"> However if I try to replace the hardcoded value with a dtml-var <dtml-call "REQUEST.set('emp_id',1741)"> <dtml-call "RESPONSE.redirect('view_by_id?emp_id=<dtml var emp_id>')"> I get ththe following error: Invalid integer value for emp_id. I've tried various combinations of quotes and double-quotes with no luck. Is ther another way to do this? Thanks. Mike