[Zope] using variables in dtml

[Steven Turoff]

Sorry for such a basic question, but I'm having problems accessing 
variables in dtml. I want to list the subfolders of a user's folder. 
Something like:

<dtml-let myUser="_.SecurityGetUser().getUserName()">
<dtml-in expr="members.myUser.objectValues('Folder')">
<li><dtml-var title_or_id></li><br>
</dtml-in>

But this results in an error because of the reference to 'myUser'. How do I 
user this variable?

Thanks,

Steve