[Zope] How to insert a DTML doc given its ID as a string?

[Bill Bell]

Must be trivial. Can't find answer.

'thisWeeklyMain' is a Python routine that supplies the name of a DTML doc=
 that _might_ exist in the current folder. I'd like to arrange to insert=
 the DTML doc, if it exists, or an alternative doc, if it does not.

Thanks for your help.

Bill

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"It is the time that you have wasted for your rose that makes your rose so=
 important."--St-Exupery