[Zope] problem with REQUEST.set

hey everyone, i am having BIG problems using REQUEST.set within Zope. I am trying to dynamically build a URL to redirect the browser to using the following code: <!--#call "REQUEST.set('jumpToBase', '../foodirectory/index.html?member Num=' + userID)"--> <!--#call "RESPONSE.redirect('jumpToBase')"--> but this is throwing back an error on the REQUEST.set part, the error looks as follows: Object: REQUEST.set('jumpToBase', '../foodirectory/index.html?memberNum =' + userDetails)) File <string>, line 0, in ? TypeError: (see above) The userDetails variable is a INT value pulled from a database and i cannot understand why it is falling over on this!! Does anyone have any thoughts? Cheers, Wom..