[Zope] If This AND This

Ok, I've looked for this in documentation, but couln't find it. Also, I have tried a number of variing syntaxes, but to no avail. What I'm trying to do is code a DTML if statement that tests two conditions: <dtml-if this && that> Do this </dtml-if> Actually, I want to do this in an <dtml-unless>, so I guess whatever the syntax is, it will be the same for both (if's and unless) Anyone out there that knows this syntax? Thanks in advance, Tommy