[Zope] newbie: how to url_quote

Hi, This is definitely a newbie question, but I can't find the answer in the list archive. Please someone kinely help ;-) I need to pass arguments to a DTML Document via url, something like errorPage?errorCode=<error code>&errorMsg=<error message>. The way errorPage is invoked is by <dtml-call "RESPONSE.redirect(errorPage...)"> Question: how do I url_quote my <error code> and <error message> in dtml-call tag? I have tried both the tag form of <dtml-var and the short hand form &dtml.url_quote but both got invalid syntax. Please help and thank in advance. Chien-pin