[Zope] python script error: pls help

[Sir K]

I have a Zcatalogue that store id of Dtml docs as part of the meta_data,
then i want to iterate over it and see if at least there will be one id
that equal to tday and return the value assigned to tday or else to store
the value of yday to tday and return it as tday.

Then my major problem is how to access the id from the Zcat_New1_Dtml_doc;

The code below is giving me 
Error Type: NameError
Error Value: global name 'id' is not defined

tday=DateTime().toZone('GMT+1').strftime('%d%m%y')
yday=(DateTime()-1).toZone('GMT+1').strftime('%d%m%y')
for i in context.Zcat_New1_Dtml_doc():
     if tday==id:
         return tday
     else:
         tday=yday
         return tday

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