[Zope] object.... from name

Hi all... well, I think this is a quite simple problem.... In a method, I want to apply an external method to a ZObject stored in the Folder: <dtml-var "CreeDetailBiblio(Special object)"> the fact is that I have the object name through the Query_string, so I tried: <dtml-var "CreeDetailBiblio(QUERY_STRING)"> which does not work.... that is clear.... as this is a string, and not my object itself how can I can find the object itself, to use it as an argument of my fonction, from its name, which is stored in the query string? I think this is very simple..... but I don't find the documentation.... Thanks for your attention