[Zope] frameset problems

I have this page: <frameset rows="75%,25%"> <frame src="<dtml-var page>"> <frame src="<dtml-call expr="getproperty(page=_['page'])">"> </frameset> The 'page' variable is in the request but no matter what I try I am having problems passing it the the python script 'getproperty'. Can anyone point me in the correct direction? Regards Garry